399352869 has 16 divisors (see below), whose sum is σ = 593017600. Its totient is φ = 265612608.

The previous prime is 399352861. The next prime is 399352873. The reversal of 399352869 is 968253993.

It is not a de Polignac number, because 399352869 - 2³ = 399352861 is a prime.

It is a super-2 number, since 2×399352869² = 318965427957062322, 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 (399352861) 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, 5389 + ... + 28770.

It is an arithmetic number, because the mean of its divisors is an integer number (37063600).

Almost surely, 2^399352869 is an apocalyptic number.

It is an amenable number.

399352869 is a deficient number, since it is larger than the sum of its proper divisors (193664731).

399352869 is a wasteful number, since it uses less digits than its factorization.

399352869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34601 (or 34595 counting only the distinct ones).

The product of its digits is 3149280, while the sum is 54.

The square root of 399352869 is about 19983.8151762870. The cubic root of 399352869 is about 736.4087434271.

The spelling of 399352869 in words is "three hundred ninety-nine million, three hundred fifty-two thousand, eight hundred sixty-nine".