252405785 has 12 divisors (see below), whose sum is σ = 319669668. Its totient is φ = 191295648.

The previous prime is 252405779. The next prime is 252405793. The reversal of 252405785 is 587504252.

It can be written as a sum of positive squares in 2 ways, for example, as 85969984 + 166435801 = 9272^2 + 12901^2 .

It is not a de Polignac number, because 252405785 - 2²⁰ = 251357209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68114 + ... + 71723.

It is an arithmetic number, because the mean of its divisors is an integer number (26639139).

Almost surely, 2^252405785 is an apocalyptic number.

It is an amenable number.

252405785 is a deficient number, since it is larger than the sum of its proper divisors (67263883).

252405785 is a wasteful number, since it uses less digits than its factorization.

252405785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139880 (or 139861 counting only the distinct ones).

The product of its (nonzero) digits is 112000, while the sum is 38.

The square root of 252405785 is about 15887.2837514787. The cubic root of 252405785 is about 631.9748102242.

The spelling of 252405785 in words is "two hundred fifty-two million, four hundred five thousand, seven hundred eighty-five".