399951393 has 8 divisors (see below), whose sum is σ = 556454208. Its totient is φ = 255041424.

The previous prime is 399951379. The next prime is 399951403. The reversal of 399951393 is 393159993.

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

It is not a de Polignac number, because 399951393 - 2²⁴ = 383174177 is a prime.

It is a super-2 number, since 2×399951393² = 319922233525280898, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (399951373) 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, 2898130 + ... + 2898267.

It is an arithmetic number, because the mean of its divisors is an integer number (69556776).

Almost surely, 2^399951393 is an apocalyptic number.

It is an amenable number.

399951393 is a deficient number, since it is larger than the sum of its proper divisors (156502815).

399951393 is a wasteful number, since it uses less digits than its factorization.

399951393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5796423.

The product of its digits is 885735, while the sum is 51.

The square root of 399951393 is about 19998.7847880815. The cubic root of 399951393 is about 736.7764535659.

The spelling of 399951393 in words is "three hundred ninety-nine million, nine hundred fifty-one thousand, three hundred ninety-three".