26439491 has 4 divisors (see below), whose sum is σ = 28473312. Its totient is φ = 24405672.

The previous prime is 26439487. The next prime is 26439499. The reversal of 26439491 is 19493462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19493462 = 2 ⋅9746731.

It is a cyclic number.

It is not a de Polignac number, because 26439491 - 2² = 26439487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26439499) 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, 1016891 + ... + 1016916.

It is an arithmetic number, because the mean of its divisors is an integer number (7118328).

Almost surely, 2^26439491 is an apocalyptic number.

26439491 is a deficient number, since it is larger than the sum of its proper divisors (2033821).

26439491 is a wasteful number, since it uses less digits than its factorization.

26439491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2033820.

The product of its digits is 46656, while the sum is 38.

The square root of 26439491 is about 5141.9345581211. The cubic root of 26439491 is about 297.9095073790.

The spelling of 26439491 in words is "twenty-six million, four hundred thirty-nine thousand, four hundred ninety-one".