26404391 has 12 divisors (see below), whose sum is σ = 29839248. Its totient is φ = 23310144.

The previous prime is 26404381. The next prime is 26404393. The reversal of 26404391 is 19340462.

It is not a de Polignac number, because 26404391 - 2⁶ = 26404327 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 (26404393) 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 11 ways as a sum of consecutive naturals, for example, 491 + ... + 7283.

It is an arithmetic number, because the mean of its divisors is an integer number (2486604).

Almost surely, 2^26404391 is an apocalyptic number.

26404391 is a deficient number, since it is larger than the sum of its proper divisors (3434857).

26404391 is a wasteful number, since it uses less digits than its factorization.

26404391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6842 (or 6829 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 26404391 is about 5138.5203123078. The cubic root of 26404391 is about 297.7776181230. Note that the first 3 decimals are identical.

The spelling of 26404391 in words is "twenty-six million, four hundred four thousand, three hundred ninety-one".