399438167 has 2 divisors, whose sum is σ = 399438168. Its totient is φ = 399438166.

The previous prime is 399438161. The next prime is 399438203. The reversal of 399438167 is 761834993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399438167 - 2²⁴ = 382660951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399438161) 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, 199719083 + 199719084.

It is an arithmetic number, because the mean of its divisors is an integer number (199719084).

Almost surely, 2^399438167 is an apocalyptic number.

399438167 is a deficient number, since it is larger than the sum of its proper divisors (1).

399438167 is an equidigital number, since it uses as much as digits as its factorization.

399438167 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 50.

The square root of 399438167 is about 19985.9492394032. The cubic root of 399438167 is about 736.4611696782.

The spelling of 399438167 in words is "three hundred ninety-nine million, four hundred thirty-eight thousand, one hundred sixty-seven".