399822643 has 32 divisors (see below), whose sum is σ = 497629440. Its totient is φ = 316431360.

The previous prime is 399822613. The next prime is 399822649. The reversal of 399822643 is 346228993.

It is a cyclic number.

It is not a de Polignac number, because 399822643 - 2²¹ = 397725491 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399822593 and 399822602.

It is not an unprimeable number, because it can be changed into a prime (399822649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 151471 + ... + 154087.

It is an arithmetic number, because the mean of its divisors is an integer number (15550920).

Almost surely, 2^399822643 is an apocalyptic number.

399822643 is a deficient number, since it is larger than the sum of its proper divisors (97806797).

399822643 is a wasteful number, since it uses less digits than its factorization.

399822643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2707.

The product of its digits is 559872, while the sum is 46.

The square root of 399822643 is about 19995.5655833987. The cubic root of 399822643 is about 736.6973855002.

The spelling of 399822643 in words is "three hundred ninety-nine million, eight hundred twenty-two thousand, six hundred forty-three".