26318639 has 2 divisors, whose sum is σ = 26318640. Its totient is φ = 26318638.

The previous prime is 26318627. The next prime is 26318641. The reversal of 26318639 is 93681362.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26318639 is a prime.

It is a Sophie Germain prime.

Together with 26318641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26318239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13159319 + 13159320.

It is an arithmetic number, because the mean of its divisors is an integer number (13159320).

Almost surely, 2^26318639 is an apocalyptic number.

26318639 is a deficient number, since it is larger than the sum of its proper divisors (1).

26318639 is an equidigital number, since it uses as much as digits as its factorization.

26318639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 38.

The square root of 26318639 is about 5130.1694903775. The cubic root of 26318639 is about 297.4549101921.

The spelling of 26318639 in words is "twenty-six million, three hundred eighteen thousand, six hundred thirty-nine".