399951331 has 8 divisors (see below), whose sum is σ = 431570160. Its totient is φ = 368454432.

The previous prime is 399951317. The next prime is 399951359. The reversal of 399951331 is 133159993.

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 399951331 - 2⁹ = 399950819 is a prime.

It is a super-2 number, since 2×399951331² = 319922134337343122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399951371) 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, 23605 + ... + 36838.

It is an arithmetic number, because the mean of its divisors is an integer number (53946270).

Almost surely, 2^399951331 is an apocalyptic number.

399951331 is a deficient number, since it is larger than the sum of its proper divisors (31618829).

399951331 is a wasteful number, since it uses less digits than its factorization.

399951331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60965.

The product of its digits is 98415, while the sum is 43.

The square root of 399951331 is about 19998.7832379873. The cubic root of 399951331 is about 736.7764154945.

The spelling of 399951331 in words is "three hundred ninety-nine million, nine hundred fifty-one thousand, three hundred thirty-one".