399767867 has 2 divisors, whose sum is σ = 399767868. Its totient is φ = 399767866.

The previous prime is 399767803. The next prime is 399767873. The reversal of 399767867 is 768767993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 399767867 - 2⁶ = 399767803 is a prime.

It is not a weakly prime, because it can be changed into another prime (399767267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199883933 + 199883934.

It is an arithmetic number, because the mean of its divisors is an integer number (199883934).

Almost surely, 2^399767867 is an apocalyptic number.

399767867 is a deficient number, since it is larger than the sum of its proper divisors (1).

399767867 is an equidigital number, since it uses as much as digits as its factorization.

399767867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24004512, while the sum is 62.

The square root of 399767867 is about 19994.1958327911. The cubic root of 399767867 is about 736.6637412668.

The spelling of 399767867 in words is "three hundred ninety-nine million, seven hundred sixty-seven thousand, eight hundred sixty-seven".