399108715 has 4 divisors (see below), whose sum is σ = 478930464. Its totient is φ = 319286968.

The previous prime is 399108707. The next prime is 399108761. The reversal of 399108715 is 517801993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 517801993 = 109 ⋅4750477.

It is a cyclic number.

It is not a de Polignac number, because 399108715 - 2³ = 399108707 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, 39910867 + ... + 39910876.

It is an arithmetic number, because the mean of its divisors is an integer number (119732616).

Almost surely, 2^399108715 is an apocalyptic number.

399108715 is a deficient number, since it is larger than the sum of its proper divisors (79821749).

399108715 is an equidigital number, since it uses as much as digits as its factorization.

399108715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79821748.

The product of its (nonzero) digits is 68040, while the sum is 43.

The square root of 399108715 is about 19977.7054488247. The cubic root of 399108715 is about 736.2586390893.

The spelling of 399108715 in words is "three hundred ninety-nine million, one hundred eight thousand, seven hundred fifteen".