26139979 has 2 divisors, whose sum is σ = 26139980. Its totient is φ = 26139978.

The previous prime is 26139977. The next prime is 26139989. The reversal of 26139979 is 97993162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26139979 - 2¹ = 26139977 is a prime.

Together with 26139977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (26139977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13069989 + 13069990.

It is an arithmetic number, because the mean of its divisors is an integer number (13069990).

Almost surely, 2^26139979 is an apocalyptic number.

26139979 is a deficient number, since it is larger than the sum of its proper divisors (1).

26139979 is an equidigital number, since it uses as much as digits as its factorization.

26139979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 183708, while the sum is 46.

The square root of 26139979 is about 5112.7271587676. The cubic root of 26139979 is about 296.7803058873.

The spelling of 26139979 in words is "twenty-six million, one hundred thirty-nine thousand, nine hundred seventy-nine".