399304881625 has 16 divisors (see below), whose sum is σ = 536665763088. Its totient is φ = 294871296000.

The previous prime is 399304881617. The next prime is 399304881631. The reversal of 399304881625 is 526188403993.

It can be written as a sum of positive squares in 8 ways, for example, as 182434911376 + 216869970249 = 427124^2 + 465693^2 .

It is not a de Polignac number, because 399304881625 - 2³ = 399304881617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399304881625.

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, 122861416 + ... + 122864665.

It is an arithmetic number, because the mean of its divisors is an integer number (33541610193).

Almost surely, 2^399304881625 is an apocalyptic number.

It is an amenable number.

399304881625 is a deficient number, since it is larger than the sum of its proper divisors (137360881463).

399304881625 is a wasteful number, since it uses less digits than its factorization.

399304881625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245726109 (or 245726099 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 58.

The spelling of 399304881625 in words is "three hundred ninety-nine billion, three hundred four million, eight hundred eighty-one thousand, six hundred twenty-five".