2489840 has 20 divisors (see below), whose sum is σ = 5789064. Its totient is φ = 995904.

The previous prime is 2489831. The next prime is 2489849. The reversal of 2489840 is 489842.

It is an interprime number because it is at equal distance from previous prime (2489831) and next prime (2489849).

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 2489840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2489849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15482 + ... + 15641.

2^2489840 is an apocalyptic number.

2489840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2489840 is an abundant number, since it is smaller than the sum of its proper divisors (3299224).

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

2489840 is a wasteful number, since it uses less digits than its factorization.

2489840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31136 (or 31130 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 2489840 is about 1577.9226850515. The cubic root of 2489840 is about 135.5367746483.

The spelling of 2489840 in words is "two million, four hundred eighty-nine thousand, eight hundred forty".