26397440 has 72 divisors (see below), whose sum is σ = 64901088. Its totient is φ = 10280960.

The previous prime is 26397439. The next prime is 26397443. The reversal of 26397440 is 4479362.

It is a self number, because there is not a number n which added to its sum of digits gives 26397440.

It is not an unprimeable number, because it can be changed into a prime (26397443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52229 + ... + 52731.

It is an arithmetic number, because the mean of its divisors is an integer number (901404).

Almost surely, 2^26397440 is an apocalyptic number.

26397440 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 26397440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32450544).

26397440 is an abundant number, since it is smaller than the sum of its proper divisors (38503648).

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

26397440 is an equidigital number, since it uses as much as digits as its factorization.

26397440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565 (or 551 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 26397440 is about 5137.8439057644. The cubic root of 26397440 is about 297.7514856781.

The spelling of 26397440 in words is "twenty-six million, three hundred ninety-seven thousand, four hundred forty".