399925749 has 8 divisors (see below), whose sum is σ = 533333152. Its totient is φ = 266567760.

The previous prime is 399925741. The next prime is 399925759. The reversal of 399925749 is 947529993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 399925749 - 2³ = 399925741 is a prime.

It is a super-2 number, since 2×399925749² = 319881209426422002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 15519 + ... + 32259.

It is an arithmetic number, because the mean of its divisors is an integer number (66666644).

Almost surely, 2^399925749 is an apocalyptic number.

It is an amenable number.

399925749 is a deficient number, since it is larger than the sum of its proper divisors (133407403).

399925749 is a wasteful number, since it uses less digits than its factorization.

399925749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24707.

The product of its digits is 5511240, while the sum is 57.

The square root of 399925749 is about 19998.1436388481. The cubic root of 399925749 is about 736.7607064030.

The spelling of 399925749 in words is "three hundred ninety-nine million, nine hundred twenty-five thousand, seven hundred forty-nine".