2491560 has 80 divisors (see below), whose sum is σ = 8385300. Its totient is φ = 663552.

The previous prime is 2491553. The next prime is 2491589. The reversal of 2491560 is 651942.

It can be written as a sum of positive squares in 2 ways, for example, as 2452356 + 39204 = 1566^2 + 198^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2856 + ... + 3624.

2^2491560 is an apocalyptic number.

2491560 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 2491560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4192650).

2491560 is an abundant number, since it is smaller than the sum of its proper divisors (5893740).

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

2491560 is a wasteful number, since it uses less digits than its factorization.

2491560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792 (or 779 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 2491560 is about 1578.4676113244. The cubic root of 2491560 is about 135.5679774019.

The spelling of 2491560 in words is "two million, four hundred ninety-one thousand, five hundred sixty".