1252389420 has 72 divisors (see below), whose sum is σ = 3801798000. Its totient is φ = 333717120.

The previous prime is 1252389419. The next prime is 1252389421. The reversal of 1252389420 is 249832521.

It is a happy number.

1252389420 is a `hidden beast` number, since 1 + 252 + 389 + 4 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (1252389419) and next prime (1252389421).

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

It is not an unprimeable number, because it can be changed into a prime (1252389421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 454206 + ... + 456954.

It is an arithmetic number, because the mean of its divisors is an integer number (52802750).

Almost surely, 2^1252389420 is an apocalyptic number.

1252389420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1252389420 is an abundant number, since it is smaller than the sum of its proper divisors (2549408580).

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

1252389420 is a wasteful number, since it uses less digits than its factorization.

1252389420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5295 (or 5290 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1252389420 is about 35389.1144280272. The cubic root of 1252389420 is about 1077.9032880448.

The spelling of 1252389420 in words is "one billion, two hundred fifty-two million, three hundred eighty-nine thousand, four hundred twenty".