252439137 has 24 divisors (see below), whose sum is σ = 386685000. Its totient is φ = 158146560.

The previous prime is 252439133. The next prime is 252439139. The reversal of 252439137 is 731934252.

It can be written as a sum of positive squares in 4 ways, for example, as 117158976 + 135280161 = 10824^2 + 11631^2 .

It is not a de Polignac number, because 252439137 - 2² = 252439133 is a prime.

It is not an unprimeable number, because it can be changed into a prime (252439133) 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, 190437 + ... + 191757.

It is an arithmetic number, because the mean of its divisors is an integer number (16111875).

Almost surely, 2^252439137 is an apocalyptic number.

It is an amenable number.

252439137 is a deficient number, since it is larger than the sum of its proper divisors (134245863).

252439137 is a wasteful number, since it uses less digits than its factorization.

252439137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2593 (or 2590 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 252439137 is about 15888.3333613063. Note that the first 4 decimals coincide. The cubic root of 252439137 is about 632.0026446306.

The spelling of 252439137 in words is "two hundred fifty-two million, four hundred thirty-nine thousand, one hundred thirty-seven".