139994579 has 2 divisors, whose sum is σ = 139994580. Its totient is φ = 139994578.

The previous prime is 139994567. The next prime is 139994581. The reversal of 139994579 is 975499931.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139994579 is a prime.

It is a Sophie Germain prime.

Together with 139994581, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139994539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69997289 + 69997290.

It is an arithmetic number, because the mean of its divisors is an integer number (69997290).

Almost surely, 2^139994579 is an apocalyptic number.

139994579 is a deficient number, since it is larger than the sum of its proper divisors (1).

139994579 is an equidigital number, since it uses as much as digits as its factorization.

139994579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2755620, while the sum is 56.

The square root of 139994579 is about 11831.9304849209. The cubic root of 139994579 is about 519.2427080723.

The spelling of 139994579 in words is "one hundred thirty-nine million, nine hundred ninety-four thousand, five hundred seventy-nine".