26090639 has 4 divisors (see below), whose sum is σ = 26107056. Its totient is φ = 26074224.

The previous prime is 26090611. The next prime is 26090663. The reversal of 26090639 is 93609062.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93609062 = 2 ⋅46804531.

It is a cyclic number.

It is not a de Polignac number, because 26090639 - 2²⁰ = 25042063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26090599 and 26090608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26090609) 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 in 3 ways as a sum of consecutive naturals, for example, 5534 + ... + 9099.

It is an arithmetic number, because the mean of its divisors is an integer number (6526764).

Almost surely, 2^26090639 is an apocalyptic number.

26090639 is a deficient number, since it is larger than the sum of its proper divisors (16417).

26090639 is a wasteful number, since it uses less digits than its factorization.

26090639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16416.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 26090639 is about 5107.8996662033. The cubic root of 26090639 is about 296.5934610153.

The spelling of 26090639 in words is "twenty-six million, ninety thousand, six hundred thirty-nine".