399822947 has 4 divisors (see below), whose sum is σ = 420866280. Its totient is φ = 378779616.

The previous prime is 399822923. The next prime is 399822953. The reversal of 399822947 is 749228993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 399822947 - 2⁸ = 399822691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399822047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10521638 + ... + 10521675.

It is an arithmetic number, because the mean of its divisors is an integer number (105216570).

Almost surely, 2^399822947 is an apocalyptic number.

399822947 is a deficient number, since it is larger than the sum of its proper divisors (21043333).

399822947 is a wasteful number, since it uses less digits than its factorization.

399822947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21043332.

The product of its digits is 1959552, while the sum is 53.

The square root of 399822947 is about 19995.5731850827. The cubic root of 399822947 is about 736.6975722129.

The spelling of 399822947 in words is "three hundred ninety-nine million, eight hundred twenty-two thousand, nine hundred forty-seven".