401139979 has 2 divisors, whose sum is σ = 401139980. Its totient is φ = 401139978.

The previous prime is 401139967. The next prime is 401140001. The reversal of 401139979 is 979931104.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 401139979 - 2²³ = 392751371 is a prime.

It is not a weakly prime, because it can be changed into another prime (401139679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200569989 + 200569990.

It is an arithmetic number, because the mean of its divisors is an integer number (200569990).

Almost surely, 2^401139979 is an apocalyptic number.

401139979 is a deficient number, since it is larger than the sum of its proper divisors (1).

401139979 is an equidigital number, since it uses as much as digits as its factorization.

401139979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 401139979 is about 20028.4791983815. The cubic root of 401139979 is about 737.5055889263.

The spelling of 401139979 in words is "four hundred one million, one hundred thirty-nine thousand, nine hundred seventy-nine".