1243395252 has 96 divisors (see below), whose sum is σ = 3523578240. Its totient is φ = 376047360.

The previous prime is 1243395191. The next prime is 1243395253. The reversal of 1243395252 is 2525933421.

1243395252 is a `hidden beast` number, since 1 + 243 + 395 + 25 + 2 = 666.

It is a super-2 number, since 2×1243395252² = 3092063505392287008, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243395253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1112598 + ... + 1113714.

It is an arithmetic number, because the mean of its divisors is an integer number (36703940).

Almost surely, 2^1243395252 is an apocalyptic number.

1243395252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1243395252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1761789120).

1243395252 is an abundant number, since it is smaller than the sum of its proper divisors (2280182988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1243395252 is a wasteful number, since it uses less digits than its factorization.

1243395252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2078 (or 2070 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 1243395252 is about 35261.8101066862. The cubic root of 1243395252 is about 1075.3167271531.

It can be divided in two parts, 1243 and 395252, that added together give a triangular number (396495 = T₈₉₀).

The spelling of 1243395252 in words is "one billion, two hundred forty-three million, three hundred ninety-five thousand, two hundred fifty-two".