2520840 has 64 divisors (see below), whose sum is σ = 8645760. Its totient is φ = 576000.

The previous prime is 2520829. The next prime is 2520841. The reversal of 2520840 is 480252.

2520840 = 91² + 92² + ... + 202².

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (2520841) 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, 661 + ... + 2340.

It is an arithmetic number, because the mean of its divisors is an integer number (135090).

2^2520840 is an apocalyptic number.

2520840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2520840 is an abundant number, since it is smaller than the sum of its proper divisors (6124920).

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

2520840 is a wasteful number, since it uses less digits than its factorization.

2520840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3022 (or 3018 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 2520840 is about 1587.7153397256. The cubic root of 2520840 is about 136.0969608441.

The spelling of 2520840 in words is "two million, five hundred twenty thousand, eight hundred forty".