399822827 has 2 divisors, whose sum is σ = 399822828. Its totient is φ = 399822826.

The previous prime is 399822821. The next prime is 399822859. The reversal of 399822827 is 728228993.

It is a weak prime.

It is an emirp because it is prime and its reverse (728228993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399822827 - 2⁴ = 399822811 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (399822821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199911413 + 199911414.

It is an arithmetic number, because the mean of its divisors is an integer number (199911414).

Almost surely, 2^399822827 is an apocalyptic number.

399822827 is a deficient number, since it is larger than the sum of its proper divisors (1).

399822827 is an equidigital number, since it uses as much as digits as its factorization.

399822827 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 50.

The square root of 399822827 is about 19995.5701844183. The cubic root of 399822827 is about 736.6974985105.

The spelling of 399822827 in words is "three hundred ninety-nine million, eight hundred twenty-two thousand, eight hundred twenty-seven".