399490437 has 4 divisors (see below), whose sum is σ = 532653920. Its totient is φ = 266326956.

The previous prime is 399490433. The next prime is 399490477. The reversal of 399490437 is 734094993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 399490437 - 2² = 399490433 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 (399490433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66581737 + ... + 66581742.

It is an arithmetic number, because the mean of its divisors is an integer number (133163480).

Almost surely, 2^399490437 is an apocalyptic number.

It is an amenable number.

399490437 is a deficient number, since it is larger than the sum of its proper divisors (133163483).

399490437 is a wasteful number, since it uses less digits than its factorization.

399490437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133163482.

The product of its (nonzero) digits is 734832, while the sum is 48.

The square root of 399490437 is about 19987.2568653130. The cubic root of 399490437 is about 736.4932924192.

The spelling of 399490437 in words is "three hundred ninety-nine million, four hundred ninety thousand, four hundred thirty-seven".