396991929 has 16 divisors (see below), whose sum is σ = 533354112. Its totient is φ = 262652928.

The previous prime is 396991897. The next prime is 396991949. The reversal of 396991929 is 929199693.

It is not a de Polignac number, because 396991929 - 2⁵ = 396991897 is a prime.

It is a super-2 number, since 2×396991929² = 315205183382282082, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (396991949) 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, 447124 + ... + 448010.

It is an arithmetic number, because the mean of its divisors is an integer number (33334632).

Almost surely, 2^396991929 is an apocalyptic number.

It is an amenable number.

396991929 is a deficient number, since it is larger than the sum of its proper divisors (136362183).

396991929 is a wasteful number, since it uses less digits than its factorization.

396991929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856.

The product of its digits is 2125764, while the sum is 57.

The square root of 396991929 is about 19924.6563082027. The cubic root of 396991929 is about 734.9546790510.

The spelling of 396991929 in words is "three hundred ninety-six million, nine hundred ninety-one thousand, nine hundred twenty-nine".