26442391 has 4 divisors (see below), whose sum is σ = 26461072. Its totient is φ = 26423712.

The previous prime is 26442379. The next prime is 26442397. The reversal of 26442391 is 19324462.

It is a happy number.

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 26442391 - 2⁵ = 26442359 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 (26442397) 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, 7026 + ... + 10111.

It is an arithmetic number, because the mean of its divisors is an integer number (6615268).

Almost surely, 2^26442391 is an apocalyptic number.

26442391 is a deficient number, since it is larger than the sum of its proper divisors (18681).

26442391 is a wasteful number, since it uses less digits than its factorization.

26442391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18680.

The product of its digits is 10368, while the sum is 31.

The square root of 26442391 is about 5142.2165454209. The cubic root of 26442391 is about 297.9203989904.

The spelling of 26442391 in words is "twenty-six million, four hundred forty-two thousand, three hundred ninety-one".