26401440 has 96 divisors (see below), whose sum is σ = 89582976. Its totient is φ = 6497280.

The previous prime is 26401423. The next prime is 26401477. The reversal of 26401440 is 4410462.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4125 + ... + 8355.

It is an arithmetic number, because the mean of its divisors is an integer number (933156).

Almost surely, 2^26401440 is an apocalyptic number.

26401440 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 26401440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44791488).

26401440 is an abundant number, since it is smaller than the sum of its proper divisors (63181536).

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

26401440 is a wasteful number, since it uses less digits than its factorization.

26401440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4262 (or 4254 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 26401440 is about 5138.2331593652. The cubic root of 26401440 is about 297.7665243307.

The spelling of 26401440 in words is "twenty-six million, four hundred one thousand, four hundred forty".