252139965 has 64 divisors (see below), whose sum is σ = 505958400. Its totient is φ = 104163840.

The previous prime is 252139939. The next prime is 252139997. The reversal of 252139965 is 569931252.

It is not a de Polignac number, because 252139965 - 2⁵ = 252139933 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 229297 + ... + 230393.

It is an arithmetic number, because the mean of its divisors is an integer number (7905600).

Almost surely, 2^252139965 is an apocalyptic number.

It is an amenable number.

252139965 is an abundant number, since it is smaller than the sum of its proper divisors (253818435).

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

252139965 is a wasteful number, since it uses less digits than its factorization.

252139965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322.

The product of its digits is 145800, while the sum is 42.

The square root of 252139965 is about 15878.9157375433. The cubic root of 252139965 is about 631.7528785019.

It can be divided in two parts, 2521 and 39965, that added together give a triangular number (42486 = T₂₉₁).

The spelling of 252139965 in words is "two hundred fifty-two million, one hundred thirty-nine thousand, nine hundred sixty-five".