26439689 has 2 divisors, whose sum is σ = 26439690. Its totient is φ = 26439688.

The previous prime is 26439671. The next prime is 26439703. The reversal of 26439689 is 98693462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25928464 + 511225 = 5092^2 + 715^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26439689 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26439289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13219844 + 13219845.

It is an arithmetic number, because the mean of its divisors is an integer number (13219845).

Almost surely, 2^26439689 is an apocalyptic number.

It is an amenable number.

26439689 is a deficient number, since it is larger than the sum of its proper divisors (1).

26439689 is an equidigital number, since it uses as much as digits as its factorization.

26439689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 47.

The square root of 26439689 is about 5141.9538115390. The cubic root of 26439689 is about 297.9102510385.

The spelling of 26439689 in words is "twenty-six million, four hundred thirty-nine thousand, six hundred eighty-nine".