252157986 has 24 divisors (see below), whose sum is σ = 546921180. Its totient is φ = 83963616.

The previous prime is 252157973. The next prime is 252158003. The reversal of 252157986 is 689751252.

It can be written as a sum of positive squares in 2 ways, for example, as 180230625 + 71927361 = 13425^2 + 8481^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11320 + ... + 25148.

Almost surely, 2^252157986 is an apocalyptic number.

252157986 is an abundant number, since it is smaller than the sum of its proper divisors (294763194).

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

252157986 is a wasteful number, since it uses less digits than its factorization.

252157986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14850 (or 14847 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 252157986 is about 15879.4831779879. The cubic root of 252157986 is about 631.7679290677.

The spelling of 252157986 in words is "two hundred fifty-two million, one hundred fifty-seven thousand, nine hundred eighty-six".