399936079 has 2 divisors, whose sum is σ = 399936080. Its totient is φ = 399936078.

The previous prime is 399936011. The next prime is 399936083. The reversal of 399936079 is 970639993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 399936079 - 2²¹ = 397838927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399936379) 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, 199968039 + 199968040.

It is an arithmetic number, because the mean of its divisors is an integer number (199968040).

Almost surely, 2^399936079 is an apocalyptic number.

399936079 is a deficient number, since it is larger than the sum of its proper divisors (1).

399936079 is an equidigital number, since it uses as much as digits as its factorization.

399936079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2480058, while the sum is 55.

The square root of 399936079 is about 19998.4019111528. The cubic root of 399936079 is about 736.7670498077.

The spelling of 399936079 in words is "three hundred ninety-nine million, nine hundred thirty-six thousand, seventy-nine".