399507323903 has 2 divisors, whose sum is σ = 399507323904. Its totient is φ = 399507323902.

The previous prime is 399507323863. The next prime is 399507323981. The reversal of 399507323903 is 309323705993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399507323903 - 2²⁶ = 399440215039 is a prime.

It is a super-2 number, since 2×399507323903² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399507323983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199753661951 + 199753661952.

It is an arithmetic number, because the mean of its divisors is an integer number (199753661952).

Almost surely, 2^399507323903 is an apocalyptic number.

399507323903 is a deficient number, since it is larger than the sum of its proper divisors (1).

399507323903 is an equidigital number, since it uses as much as digits as its factorization.

399507323903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4133430, while the sum is 53.

The spelling of 399507323903 in words is "three hundred ninety-nine billion, five hundred seven million, three hundred twenty-three thousand, nine hundred three".