2591440 has 40 divisors (see below), whose sum is σ = 6238440. Its totient is φ = 999936.

The previous prime is 2591419. The next prime is 2591441. The reversal of 2591440 is 441952.

It can be written as a sum of positive squares in 4 ways, for example, as 5776 + 2585664 = 76^2 + 1608^2 .

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

It is a super-2 number, since 2×2591440² = 13431122547200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2591441) 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, 1762 + ... + 2878.

It is an arithmetic number, because the mean of its divisors is an integer number (155961).

2^2591440 is an apocalyptic number.

2591440 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 2591440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3119220).

2591440 is an abundant number, since it is smaller than the sum of its proper divisors (3647000).

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

2591440 is a wasteful number, since it uses less digits than its factorization.

2591440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159 (or 1153 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2591440 is about 1609.7950180070. The cubic root of 2591440 is about 137.3558158017.

The spelling of 2591440 in words is "two million, five hundred ninety-one thousand, four hundred forty".