399925306517 has 16 divisors (see below), whose sum is σ = 459434488320. Its totient is φ = 344290690800.

The previous prime is 399925306507. The next prime is 399925306531. The reversal of 399925306517 is 715603529993.

It is a cyclic number.

It is not a de Polignac number, because 399925306517 - 2⁶ = 399925306453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399925306507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111542 + ... + 901272.

It is an arithmetic number, because the mean of its divisors is an integer number (28714655520).

Almost surely, 2^399925306517 is an apocalyptic number.

It is an amenable number.

399925306517 is a deficient number, since it is larger than the sum of its proper divisors (59509181803).

399925306517 is a wasteful number, since it uses less digits than its factorization.

399925306517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792184.

The product of its (nonzero) digits is 13778100, while the sum is 59.

The spelling of 399925306517 in words is "three hundred ninety-nine billion, nine hundred twenty-five million, three hundred six thousand, five hundred seventeen".