399926867 has 2 divisors, whose sum is σ = 399926868. Its totient is φ = 399926866.

The previous prime is 399926861. The next prime is 399926881. The reversal of 399926867 is 768629993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399926867 - 2¹⁸ = 399664723 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (399926861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199963433 + 199963434.

It is an arithmetic number, because the mean of its divisors is an integer number (199963434).

Almost surely, 2^399926867 is an apocalyptic number.

399926867 is a deficient number, since it is larger than the sum of its proper divisors (1).

399926867 is an equidigital number, since it uses as much as digits as its factorization.

399926867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8817984, while the sum is 59.

The square root of 399926867 is about 19998.1715914231. The cubic root of 399926867 is about 736.7613929452.

The spelling of 399926867 in words is "three hundred ninety-nine million, nine hundred twenty-six thousand, eight hundred sixty-seven".