252499640 has 64 divisors (see below), whose sum is σ = 603612000. Its totient is φ = 94732288.

The previous prime is 252499613. The next prime is 252499661. The reversal of 252499640 is 46994252.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304907 + ... + 305733.

Almost surely, 2^252499640 is an apocalyptic number.

252499640 is a gapful number since it is divisible by the number (20) 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 252499640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301806000).

252499640 is an abundant number, since it is smaller than the sum of its proper divisors (351112360).

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

252499640 is a wasteful number, since it uses less digits than its factorization.

252499640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1304 (or 1300 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 252499640 is about 15890.2372543647. The cubic root of 252499640 is about 632.0531320497.

The spelling of 252499640 in words is "two hundred fifty-two million, four hundred ninety-nine thousand, six hundred forty".