399424565925 has 288 divisors, whose sum is σ = 979728721920. Its totient is φ = 150417907200.

The previous prime is 399424565851. The next prime is 399424565929. The reversal of 399424565925 is 529565424993.

399424565925 is a `hidden beast` number, since 3 + 9 + 9 + 42 + 4 + 565 + 9 + 25 = 666.

It is not a de Polignac number, because 399424565925 - 2⁸ = 399424565669 is a prime.

It is a super-2 number, since 2×399424565925² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399424565929) by changing a digit.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 7544647 + ... + 7597403.

It is an arithmetic number, because the mean of its divisors is an integer number (3401835840).

Almost surely, 2^399424565925 is an apocalyptic number.

399424565925 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

399424565925 is an abundant number, since it is smaller than the sum of its proper divisors (580304155995).

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

399424565925 is a wasteful number, since it uses less digits than its factorization.

399424565925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52833 (or 52825 counting only the distinct ones).

The product of its digits is 104976000, while the sum is 63.

The spelling of 399424565925 in words is "three hundred ninety-nine billion, four hundred twenty-four million, five hundred sixty-five thousand, nine hundred twenty-five".