2581904 has 20 divisors (see below), whose sum is σ = 5387676. Its totient is φ = 1191552.

The previous prime is 2581877. The next prime is 2581907. The reversal of 2581904 is 4091852.

It can be written as a sum of positive squares in 2 ways, for example, as 565504 + 2016400 = 752^2 + 1420^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2581907) 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, 5999 + ... + 6414.

2^2581904 is an apocalyptic number.

It is an amenable number.

2581904 is an abundant number, since it is smaller than the sum of its proper divisors (2805772).

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

2581904 is a wasteful number, since it uses less digits than its factorization.

2581904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12434 (or 12428 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 2581904 is about 1606.8304204240. The cubic root of 2581904 is about 137.1871277381.

The spelling of 2581904 in words is "two million, five hundred eighty-one thousand, nine hundred four".