26131440 has 40 divisors (see below), whose sum is σ = 81008208. Its totient is φ = 6968320.

The previous prime is 26131439. The next prime is 26131451. The reversal of 26131440 is 4413162.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54201 + ... + 54680.

Almost surely, 2^26131440 is an apocalyptic number.

26131440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26131440 is an abundant number, since it is smaller than the sum of its proper divisors (54876768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26131440 is a wasteful number, since it uses less digits than its factorization.

26131440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108897 (or 108891 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 26131440 is about 5111.8920176389. The cubic root of 26131440 is about 296.7479865164.

The spelling of 26131440 in words is "twenty-six million, one hundred thirty-one thousand, four hundred forty".