399652957 has 6 divisors (see below), whose sum is σ = 439288094. Its totient is φ = 363320760.

The previous prime is 399652937. The next prime is 399652963. The reversal of 399652957 is 759256993.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 398162116 + 1490841 = 19954^2 + 1221^2 .

It is not a de Polignac number, because 399652957 - 2⁷ = 399652829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399652898 and 399652907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399652927) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1651338 + ... + 1651579.

Almost surely, 2^399652957 is an apocalyptic number.

It is an amenable number.

399652957 is a deficient number, since it is larger than the sum of its proper divisors (39635137).

399652957 is a wasteful number, since it uses less digits than its factorization.

399652957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3302939 (or 3302928 counting only the distinct ones).

The product of its digits is 4592700, while the sum is 55.

The square root of 399652957 is about 19991.3220423263. The cubic root of 399652957 is about 736.5931518494.

It can be divided in two parts, 3996 and 52957, that added together give a triangular number (56953 = T₃₃₇).

The spelling of 399652957 in words is "three hundred ninety-nine million, six hundred fifty-two thousand, nine hundred fifty-seven".