399566371 has 8 divisors (see below), whose sum is σ = 423118080. Its totient is φ = 376266888.

The previous prime is 399566353. The next prime is 399566383. The reversal of 399566371 is 173665993.

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 399566371 - 2⁵ = 399566339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399576371) 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, 59791 + ... + 66136.

It is an arithmetic number, because the mean of its divisors is an integer number (52889760).

Almost surely, 2^399566371 is an apocalyptic number.

399566371 is a deficient number, since it is larger than the sum of its proper divisors (23551709).

399566371 is a wasteful number, since it uses less digits than its factorization.

399566371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126113.

The product of its digits is 918540, while the sum is 49.

The square root of 399566371 is about 19989.1563353734. The cubic root of 399566371 is about 736.5399529760.

The spelling of 399566371 in words is "three hundred ninety-nine million, five hundred sixty-six thousand, three hundred seventy-one".