26397840 has 160 divisors (see below), whose sum is σ = 98565120. Its totient is φ = 5709312.

The previous prime is 26397827. The next prime is 26397887. The reversal of 26397840 is 4879362.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31507 + ... + 32333.

It is an arithmetic number, because the mean of its divisors is an integer number (616032).

Almost surely, 2^26397840 is an apocalyptic number.

26397840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26397840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49282560).

26397840 is an abundant number, since it is smaller than the sum of its proper divisors (72167280).

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

26397840 is a wasteful number, since it uses less digits than its factorization.

26397840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869 (or 863 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 26397840 is about 5137.8828324515. The cubic root of 26397840 is about 297.7529896117.

The spelling of 26397840 in words is "twenty-six million, three hundred ninety-seven thousand, eight hundred forty".