399226567 has 2 divisors, whose sum is σ = 399226568. Its totient is φ = 399226566.

The previous prime is 399226549. The next prime is 399226591. The reversal of 399226567 is 765622993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399226567 - 2¹⁵ = 399193799 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399226567.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399226547) 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, 199613283 + 199613284.

It is an arithmetic number, because the mean of its divisors is an integer number (199613284).

Almost surely, 2^399226567 is an apocalyptic number.

399226567 is a deficient number, since it is larger than the sum of its proper divisors (1).

399226567 is an equidigital number, since it uses as much as digits as its factorization.

399226567 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 49.

The square root of 399226567 is about 19980.6548190994. The cubic root of 399226567 is about 736.3311013956.

The spelling of 399226567 in words is "three hundred ninety-nine million, two hundred twenty-six thousand, five hundred sixty-seven".