399266986 has 8 divisors (see below), whose sum is σ = 599279364. Its totient is φ = 199507200.

The previous prime is 399266957. The next prime is 399267019. The reversal of 399266986 is 689662993.

It can be written as a sum of positive squares in 2 ways, for example, as 380991361 + 18275625 = 19519^2 + 4275^2 .

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

It is a super-2 number, since 2×399266986² = 318828252219048392, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 399266986.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59145 + ... + 65548.

Almost surely, 2^399266986 is an apocalyptic number.

399266986 is a deficient number, since it is larger than the sum of its proper divisors (200012378).

399266986 is a wasteful number, since it uses less digits than its factorization.

399266986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126296.

The product of its digits is 7558272, while the sum is 58.

The square root of 399266986 is about 19981.6662468374. Note that the first 3 decimals coincide. The cubic root of 399266986 is about 736.3559500780.

The spelling of 399266986 in words is "three hundred ninety-nine million, two hundred sixty-six thousand, nine hundred eighty-six".