26389639 has 2 divisors, whose sum is σ = 26389640. Its totient is φ = 26389638.

The previous prime is 26389603. The next prime is 26389667. The reversal of 26389639 is 93698362.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26389639 - 2⁹ = 26389127 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 (26389669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13194819 + 13194820.

It is an arithmetic number, because the mean of its divisors is an integer number (13194820).

Almost surely, 2^26389639 is an apocalyptic number.

26389639 is a deficient number, since it is larger than the sum of its proper divisors (1).

26389639 is an equidigital number, since it uses as much as digits as its factorization.

26389639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 419904, while the sum is 46.

The square root of 26389639 is about 5137.0846790763. The cubic root of 26389639 is about 297.7221521747.

It can be divided in two parts, 26389 and 639, that added together give a triangular number (27028 = T₂₃₂).

The spelling of 26389639 in words is "twenty-six million, three hundred eighty-nine thousand, six hundred thirty-nine".