26297440 has 96 divisors (see below), whose sum is σ = 68584320. Its totient is φ = 9467904.

The previous prime is 26297437. The next prime is 26297443. The reversal of 26297440 is 4479262.

It is an interprime number because it is at equal distance from previous prime (26297437) and next prime (26297443).

It is a junction number, because it is equal to n+sod(n) for n = 26297396 and 26297405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26297443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97626 + ... + 97894.

It is an arithmetic number, because the mean of its divisors is an integer number (714420).

Almost surely, 2^26297440 is an apocalyptic number.

26297440 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 26297440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34292160).

26297440 is an abundant number, since it is smaller than the sum of its proper divisors (42286880).

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

26297440 is a wasteful number, since it uses less digits than its factorization.

26297440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344 (or 336 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 26297440 is about 5128.1029630849. The cubic root of 26297440 is about 297.3750245967.

The spelling of 26297440 in words is "twenty-six million, two hundred ninety-seven thousand, four hundred forty".