399903131 has 8 divisors (see below), whose sum is σ = 413097984. Its totient is φ = 386726760.

The previous prime is 399903113. The next prime is 399903149. The reversal of 399903131 is 131309993.

It is an interprime number because it is at equal distance from previous prime (399903113) and next prime (399903149).

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

It is a cyclic number.

It is not a de Polignac number, because 399903131 - 2¹⁸ = 399640987 is a prime.

It is a super-2 number, since 2×399903131² = 319845028367206322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399903151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49670 + ... + 57156.

It is an arithmetic number, because the mean of its divisors is an integer number (51637248).

Almost surely, 2^399903131 is an apocalyptic number.

399903131 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

399903131 is a deficient number, since it is larger than the sum of its proper divisors (13194853).

399903131 is a wasteful number, since it uses less digits than its factorization.

399903131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9241.

The product of its (nonzero) digits is 19683, while the sum is 38.

The square root of 399903131 is about 19997.5781283634. The cubic root of 399903131 is about 736.7468168516.

The spelling of 399903131 in words is "three hundred ninety-nine million, nine hundred three thousand, one hundred thirty-one".