26980391 has 2 divisors, whose sum is σ = 26980392. Its totient is φ = 26980390.

The previous prime is 26980333. The next prime is 26980441. The reversal of 26980391 is 19308962.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26980391 - 2¹⁸ = 26718247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26980301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13490195 + 13490196.

It is an arithmetic number, because the mean of its divisors is an integer number (13490196).

Almost surely, 2^26980391 is an apocalyptic number.

26980391 is a deficient number, since it is larger than the sum of its proper divisors (1).

26980391 is an equidigital number, since it uses as much as digits as its factorization.

26980391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 26980391 is about 5194.2652030870. The cubic root of 26980391 is about 299.9273564852.

The spelling of 26980391 in words is "twenty-six million, nine hundred eighty thousand, three hundred ninety-one".