2561404 has 12 divisors (see below), whose sum is σ = 4526704. Its totient is φ = 1268064.

The previous prime is 2561401. The next prime is 2561411. The reversal of 2561404 is 4041652.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561401) 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, 2697 + ... + 3520.

2^2561404 is an apocalyptic number.

It is an amenable number.

2561404 is a deficient number, since it is larger than the sum of its proper divisors (1965300).

2561404 is a wasteful number, since it uses less digits than its factorization.

2561404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6324 (or 6322 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 2561404 is about 1600.4386898598. The cubic root of 2561404 is about 136.8230795619.

The spelling of 2561404 in words is "two million, five hundred sixty-one thousand, four hundred four".