26439431 has 4 divisors (see below), whose sum is σ = 27831000. Its totient is φ = 25047864.

The previous prime is 26439377. The next prime is 26439449. The reversal of 26439431 is 13493462.

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 26439431 - 2¹⁰ = 26438407 is a prime.

It is a super-2 number, since 2×26439431² = 1398087023207522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26439451) 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, 695756 + ... + 695793.

It is an arithmetic number, because the mean of its divisors is an integer number (6957750).

Almost surely, 2^26439431 is an apocalyptic number.

26439431 is a deficient number, since it is larger than the sum of its proper divisors (1391569).

26439431 is a wasteful number, since it uses less digits than its factorization.

26439431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391568.

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

The square root of 26439431 is about 5141.9287237378. The cubic root of 26439431 is about 297.9092820269.

The spelling of 26439431 in words is "twenty-six million, four hundred thirty-nine thousand, four hundred thirty-one".