399517 has 8 divisors (see below), whose sum is σ = 430272. Its totient is φ = 369600.

The previous prime is 399499. The next prime is 399523. The reversal of 399517 is 715993.

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 399517 - 2⁷ = 399389 is a prime.

It is a super-2 number, since 2×399517² = 319227666578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399527) 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, 1042 + ... + 1372.

It is an arithmetic number, because the mean of its divisors is an integer number (53784).

2³⁹⁹⁵¹⁷ is an apocalyptic number.

It is an amenable number.

399517 is a deficient number, since it is larger than the sum of its proper divisors (30755).

399517 is a wasteful number, since it uses less digits than its factorization.

399517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419.

The product of its digits is 8505, while the sum is 34.

The square root of 399517 is about 632.0735716671. The cubic root of 399517 is about 73.6509615745.

The spelling of 399517 in words is "three hundred ninety-nine thousand, five hundred seventeen".