26157689 has 2 divisors, whose sum is σ = 26157690. Its totient is φ = 26157688.

The previous prime is 26157683. The next prime is 26157697. The reversal of 26157689 is 98675162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14137600 + 12020089 = 3760^2 + 3467^2 .

It is a cyclic number.

It is not a de Polignac number, because 26157689 - 2¹⁶ = 26092153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26157683) 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, 13078844 + 13078845.

It is an arithmetic number, because the mean of its divisors is an integer number (13078845).

Almost surely, 2^26157689 is an apocalyptic number.

It is an amenable number.

26157689 is a deficient number, since it is larger than the sum of its proper divisors (1).

26157689 is an equidigital number, since it uses as much as digits as its factorization.

26157689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The square root of 26157689 is about 5114.4588179005. The cubic root of 26157689 is about 296.8473142640.

The spelling of 26157689 in words is "twenty-six million, one hundred fifty-seven thousand, six hundred eighty-nine".