399113221 has 8 divisors (see below), whose sum is σ = 452436320. Its totient is φ = 349021872.

The previous prime is 399113207. The next prime is 399113279. The reversal of 399113221 is 122311993.

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 399113221 - 2⁷ = 399113093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399113321) 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, 807675 + ... + 808168.

It is an arithmetic number, because the mean of its divisors is an integer number (56554540).

Almost surely, 2^399113221 is an apocalyptic number.

It is an amenable number.

399113221 is a deficient number, since it is larger than the sum of its proper divisors (53323099).

399113221 is a wasteful number, since it uses less digits than its factorization.

399113221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1615875.

The product of its digits is 2916, while the sum is 31.

The square root of 399113221 is about 19977.8182242206. The cubic root of 399113221 is about 736.2614099040.

The spelling of 399113221 in words is "three hundred ninety-nine million, one hundred thirteen thousand, two hundred twenty-one".