1243152240 has 80 divisors (see below), whose sum is σ = 4204123776. Its totient is φ = 301369600.

The previous prime is 1243152227. The next prime is 1243152241. The reversal of 1243152240 is 422513421.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1243152240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243152241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232806 + ... + 238085.

Almost surely, 2^1243152240 is an apocalyptic number.

1243152240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243152240 is an abundant number, since it is smaller than the sum of its proper divisors (2960971536).

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

1243152240 is a wasteful number, since it uses less digits than its factorization.

1243152240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470918 (or 470912 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1243152240 is about 35258.3641140652. The cubic root of 1243152240 is about 1075.2466684720.

Adding to 1243152240 its reverse (422513421), we get a palindrome (1665665661).

The spelling of 1243152240 in words is "one billion, two hundred forty-three million, one hundred fifty-two thousand, two hundred forty".