399683087 has 4 divisors (see below), whose sum is σ = 400134576. Its totient is φ = 399231600.

The previous prime is 399683083. The next prime is 399683101. The reversal of 399683087 is 780386993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 399683087 - 2² = 399683083 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399683083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224414 + ... + 226187.

It is an arithmetic number, because the mean of its divisors is an integer number (100033644).

Almost surely, 2^399683087 is an apocalyptic number.

399683087 is a deficient number, since it is larger than the sum of its proper divisors (451489).

399683087 is an equidigital number, since it uses as much as digits as its factorization.

399683087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451488.

The product of its (nonzero) digits is 1959552, while the sum is 53.

The square root of 399683087 is about 19992.0756050991. The cubic root of 399683087 is about 736.6116620706.

The spelling of 399683087 in words is "three hundred ninety-nine million, six hundred eighty-three thousand, eighty-seven".