399822047 has 2 divisors, whose sum is σ = 399822048. Its totient is φ = 399822046.

The previous prime is 399822023. The next prime is 399822079. The reversal of 399822047 is 740228993.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399822047 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 399821989 and 399822007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399828047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199911023 + 199911024.

It is an arithmetic number, because the mean of its divisors is an integer number (199911024).

Almost surely, 2^399822047 is an apocalyptic number.

399822047 is a deficient number, since it is larger than the sum of its proper divisors (1).

399822047 is an equidigital number, since it uses as much as digits as its factorization.

399822047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 399822047 is about 19995.5506800888. The cubic root of 399822047 is about 736.6970194446.

The spelling of 399822047 in words is "three hundred ninety-nine million, eight hundred twenty-two thousand, forty-seven".