26842639 has 4 divisors (see below), whose sum is σ = 26856424. Its totient is φ = 26828856.

The previous prime is 26842619. The next prime is 26842663. The reversal of 26842639 is 93624862.

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 26842639 - 2⁷ = 26842511 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 (26842619) 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, 3372 + ... + 8065.

It is an arithmetic number, because the mean of its divisors is an integer number (6714106).

Almost surely, 2^26842639 is an apocalyptic number.

26842639 is a deficient number, since it is larger than the sum of its proper divisors (13785).

26842639 is a wasteful number, since it uses less digits than its factorization.

26842639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13784.

The product of its digits is 124416, while the sum is 40.

The square root of 26842639 is about 5180.9882261978. The cubic root of 26842639 is about 299.4160455430.

The spelling of 26842639 in words is "twenty-six million, eight hundred forty-two thousand, six hundred thirty-nine".