26402639 has 4 divisors (see below), whose sum is σ = 26900856. Its totient is φ = 25904424.

The previous prime is 26402627. The next prime is 26402653. The reversal of 26402639 is 93620462.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 26402639 - 2²⁴ = 9625423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26402659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249029 + ... + 249134.

It is an arithmetic number, because the mean of its divisors is an integer number (6725214).

Almost surely, 2^26402639 is an apocalyptic number.

26402639 is a deficient number, since it is larger than the sum of its proper divisors (498217).

26402639 is an equidigital number, since it uses as much as digits as its factorization.

26402639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498216.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 26402639 is about 5138.3498323878. The cubic root of 26402639 is about 297.7710318709.

The spelling of 26402639 in words is "twenty-six million, four hundred two thousand, six hundred thirty-nine".