399645115 has 8 divisors (see below), whose sum is σ = 479719728. Its totient is φ = 319619040.

The previous prime is 399645109. The next prime is 399645161. The reversal of 399645115 is 511546993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 399645115 - 2¹⁵ = 399612347 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9489 + ... + 29821.

It is an arithmetic number, because the mean of its divisors is an integer number (59964966).

Almost surely, 2^399645115 is an apocalyptic number.

399645115 is a deficient number, since it is larger than the sum of its proper divisors (80074613).

399645115 is a wasteful number, since it uses less digits than its factorization.

399645115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24269.

The product of its digits is 145800, while the sum is 43.

The square root of 399645115 is about 19991.1259062615. The cubic root of 399645115 is about 736.5883340017.

The spelling of 399645115 in words is "three hundred ninety-nine million, six hundred forty-five thousand, one hundred fifteen".