399394317 has 16 divisors (see below), whose sum is σ = 625050752. Its totient is φ = 222056640.

The previous prime is 399394313. The next prime is 399394327. The reversal of 399394317 is 713493993.

It is not a de Polignac number, because 399394317 - 2² = 399394313 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 (399394313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256234 + ... + 257787.

It is an arithmetic number, because the mean of its divisors is an integer number (39065672).

Almost surely, 2^399394317 is an apocalyptic number.

399394317 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

399394317 is a deficient number, since it is larger than the sum of its proper divisors (225656435).

399394317 is a wasteful number, since it uses less digits than its factorization.

399394317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514068.

The product of its digits is 551124, while the sum is 48.

The square root of 399394317 is about 19984.8521885952. The cubic root of 399394317 is about 736.4342193208.

It can be divided in two parts, 399 and 394317, that added together give a triangular number (394716 = T₈₈₈).

The spelling of 399394317 in words is "three hundred ninety-nine million, three hundred ninety-four thousand, three hundred seventeen".