26930639 has 2 divisors, whose sum is σ = 26930640. Its totient is φ = 26930638.

The previous prime is 26930633. The next prime is 26930693. The reversal of 26930639 is 93603962.

Together with next prime (26930693) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26930639 - 2⁴ = 26930623 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26930633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13465319 + 13465320.

It is an arithmetic number, because the mean of its divisors is an integer number (13465320).

Almost surely, 2^26930639 is an apocalyptic number.

26930639 is a deficient number, since it is larger than the sum of its proper divisors (1).

26930639 is an equidigital number, since it uses as much as digits as its factorization.

26930639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 38.

The square root of 26930639 is about 5189.4738654318. The cubic root of 26930639 is about 299.7428871136.

The spelling of 26930639 in words is "twenty-six million, nine hundred thirty thousand, six hundred thirty-nine".