399515 has 4 divisors (see below), whose sum is σ = 479424. Its totient is φ = 319608.

The previous prime is 399499. The next prime is 399523. The reversal of 399515 is 515993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 399515 - 2⁴ = 399499 is a prime.

It is a super-2 number, since 2×399515² = 319224470450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39947 + ... + 39956.

It is an arithmetic number, because the mean of its divisors is an integer number (119856).

2³⁹⁹⁵¹⁵ is an apocalyptic number.

399515 is a deficient number, since it is larger than the sum of its proper divisors (79909).

399515 is an equidigital number, since it uses as much as digits as its factorization.

399515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79908.

The product of its digits is 6075, while the sum is 32.

The square root of 399515 is about 632.0719895708. The cubic root of 399515 is about 73.6508386743.

The spelling of 399515 in words is "three hundred ninety-nine thousand, five hundred fifteen".