2561406 has 32 divisors (see below), whose sum is σ = 5419008. Its totient is φ = 805920.

The previous prime is 2561401. The next prime is 2561411. The reversal of 2561406 is 6041652.

It is an interprime number because it is at equal distance from previous prime (2561401) and next prime (2561411).

It is an Ulam number.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8596 + ... + 8888.

It is an arithmetic number, because the mean of its divisors is an integer number (169344).

2^2561406 is an apocalyptic number.

2561406 is an abundant number, since it is smaller than the sum of its proper divisors (2857602).

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

2561406 is a wasteful number, since it uses less digits than its factorization.

2561406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 2561406 is about 1600.4393146883. The cubic root of 2561406 is about 136.8231151734.

The spelling of 2561406 in words is "two million, five hundred sixty-one thousand, four hundred six".