47139979 has 2 divisors, whose sum is σ = 47139980. Its totient is φ = 47139978.

The previous prime is 47139971. The next prime is 47140001. The reversal of 47139979 is 97993174.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 47139979 - 2³ = 47139971 is a prime.

It is not a weakly prime, because it can be changed into another prime (47139971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23569989 + 23569990.

It is an arithmetic number, because the mean of its divisors is an integer number (23569990).

Almost surely, 2^47139979 is an apocalyptic number.

47139979 is a deficient number, since it is larger than the sum of its proper divisors (1).

47139979 is an equidigital number, since it uses as much as digits as its factorization.

47139979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 428652, while the sum is 49.

The square root of 47139979 is about 6865.8560282022. The cubic root of 47139979 is about 361.2405223345.

The spelling of 47139979 in words is "forty-seven million, one hundred thirty-nine thousand, nine hundred seventy-nine".