399423037 has 18 divisors (see below), whose sum is σ = 451536666. Its totient is φ = 351204480.

The previous prime is 399422981. The next prime is 399423043. The reversal of 399423037 is 730324993.

It can be written as a sum of positive squares in 3 ways, for example, as 79227801 + 320195236 = 8901^2 + 17894^2 .

It is not a de Polignac number, because 399423037 - 2⁷ = 399422909 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 (399423337) 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 17 ways as a sum of consecutive naturals, for example, 1657237 + ... + 1657477.

Almost surely, 2^399423037 is an apocalyptic number.

It is an amenable number.

399423037 is a deficient number, since it is larger than the sum of its proper divisors (52113629).

399423037 is an equidigital number, since it uses as much as digits as its factorization.

399423037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 40.

The square root of 399423037 is about 19985.5707198969. The cubic root of 399423037 is about 736.4518709522.

The spelling of 399423037 in words is "three hundred ninety-nine million, four hundred twenty-three thousand, thirty-seven".