399925747 has 32 divisors (see below), whose sum is σ = 460615680. Its totient is φ = 344615040.

The previous prime is 399925741. The next prime is 399925759. The reversal of 399925747 is 747529993.

It is a cyclic number.

It is not a de Polignac number, because 399925747 - 2³ = 399925739 is a prime.

It is a super-2 number, since 2×399925747² = 319881206227016018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399925741) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1793278 + ... + 1793500.

It is an arithmetic number, because the mean of its divisors is an integer number (14394240).

Almost surely, 2^399925747 is an apocalyptic number.

399925747 is a deficient number, since it is larger than the sum of its proper divisors (60689933).

399925747 is a wasteful number, since it uses less digits than its factorization.

399925747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403.

The product of its digits is 4286520, while the sum is 55.

The square root of 399925747 is about 19998.1435888434. The cubic root of 399925747 is about 736.7607051749.

The spelling of 399925747 in words is "three hundred ninety-nine million, nine hundred twenty-five thousand, seven hundred forty-seven".