6139979 has 2 divisors, whose sum is σ = 6139980. Its totient is φ = 6139978.

The previous prime is 6139961. The next prime is 6139993. The reversal of 6139979 is 9799316.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6139979 - 2⁸ = 6139723 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6139949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3069989 + 3069990.

It is an arithmetic number, because the mean of its divisors is an integer number (3069990).

Almost surely, 2^6139979 is an apocalyptic number.

6139979 is a deficient number, since it is larger than the sum of its proper divisors (1).

6139979 is an equidigital number, since it uses as much as digits as its factorization.

6139979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91854, while the sum is 44.

The square root of 6139979 is about 2477.8981012140. The cubic root of 6139979 is about 183.1143143947.

The spelling of 6139979 in words is "six million, one hundred thirty-nine thousand, nine hundred seventy-nine".