399115 has 4 divisors (see below), whose sum is σ = 478944. Its totient is φ = 319288.

The previous prime is 399107. The next prime is 399131. The reversal of 399115 is 511993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 511993 = 19 ⋅26947.

It is a cyclic number.

It is not a de Polignac number, because 399115 - 2³ = 399107 is a prime.

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, 39907 + ... + 39916.

It is an arithmetic number, because the mean of its divisors is an integer number (119736).

2³⁹⁹¹¹⁵ is an apocalyptic number.

399115 is a deficient number, since it is larger than the sum of its proper divisors (79829).

399115 is an equidigital number, since it uses as much as digits as its factorization.

399115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79828.

The product of its digits is 1215, while the sum is 28.

The square root of 399115 is about 631.7554906766. The cubic root of 399115 is about 73.6262503835.

The spelling of 399115 in words is "three hundred ninety-nine thousand, one hundred fifteen".