26690639 has 2 divisors, whose sum is σ = 26690640. Its totient is φ = 26690638.

The previous prime is 26690623. The next prime is 26690681. The reversal of 26690639 is 93609662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26690639 - 2⁴ = 26690623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26690596 and 26690605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26690239) 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, 13345319 + 13345320.

It is an arithmetic number, because the mean of its divisors is an integer number (13345320).

Almost surely, 2^26690639 is an apocalyptic number.

26690639 is a deficient number, since it is larger than the sum of its proper divisors (1).

26690639 is an equidigital number, since it uses as much as digits as its factorization.

26690639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 26690639 is about 5166.2983847238. The cubic root of 26690639 is about 298.8498143977.

The spelling of 26690639 in words is "twenty-six million, six hundred ninety thousand, six hundred thirty-nine".