26797721 has 2 divisors, whose sum is σ = 26797722. Its totient is φ = 26797720.

The previous prime is 26797717. The next prime is 26797739. The reversal of 26797721 is 12779762.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23629321 + 3168400 = 4861^2 + 1780^2 .

It is a cyclic number.

It is not a de Polignac number, because 26797721 - 2² = 26797717 is a prime.

It is not a weakly prime, because it can be changed into another prime (26797751) 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, 13398860 + 13398861.

It is an arithmetic number, because the mean of its divisors is an integer number (13398861).

Almost surely, 2^26797721 is an apocalyptic number.

It is an amenable number.

26797721 is a deficient number, since it is larger than the sum of its proper divisors (1).

26797721 is an equidigital number, since it uses as much as digits as its factorization.

26797721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 74088, while the sum is 41.

The square root of 26797721 is about 5176.6515239100. The cubic root of 26797721 is about 299.2489397828.

The spelling of 26797721 in words is "twenty-six million, seven hundred ninety-seven thousand, seven hundred twenty-one".