2521904 has 80 divisors (see below), whose sum is σ = 6428160. Its totient is φ = 929280.

The previous prime is 2521901. The next prime is 2521919. The reversal of 2521904 is 4091252.

2521904 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a self number, because there is not a number n which added to its sum of digits gives 2521904.

It is not an unprimeable number, because it can be changed into a prime (2521901) by changing a digit.

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, 28292 + ... + 28380.

It is an arithmetic number, because the mean of its divisors is an integer number (80352).

2^2521904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2521904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3214080).

2521904 is an abundant number, since it is smaller than the sum of its proper divisors (3906256).

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

2521904 is a wasteful number, since it uses less digits than its factorization.

2521904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 2521904 is about 1588.0503770347. The cubic root of 2521904 is about 136.1161061551.

It can be divided in two parts, 25 and 21904, that multiplied together give a square (547600 = 740²).

The spelling of 2521904 in words is "two million, five hundred twenty-one thousand, nine hundred four".