2561396 has 24 divisors (see below), whose sum is σ = 4717440. Its totient is φ = 1215200.

The previous prime is 2561389. The next prime is 2561401. The reversal of 2561396 is 6931652.

It is a happy number.

2561396 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8081 + ... + 8391.

It is an arithmetic number, because the mean of its divisors is an integer number (196560).

2^2561396 is an apocalyptic number.

It is an amenable number.

2561396 is a deficient number, since it is larger than the sum of its proper divisors (2156044).

2561396 is a wasteful number, since it uses less digits than its factorization.

2561396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415 (or 413 counting only the distinct ones).

The product of its digits is 9720, while the sum is 32.

The square root of 2561396 is about 1600.4361905431. The cubic root of 2561396 is about 136.8229371158.

The spelling of 2561396 in words is "two million, five hundred sixty-one thousand, three hundred ninety-six".