2581944 has 16 divisors (see below), whose sum is σ = 6454920. Its totient is φ = 860640.

The previous prime is 2581939. The next prime is 2581951. The reversal of 2581944 is 4491852.

2581944 = T₂₃₁ + T₂₃₂ + ... + T₃₀₂.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53767 + ... + 53814.

2^2581944 is an apocalyptic number.

2581944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2581944 is an abundant number, since it is smaller than the sum of its proper divisors (3872976).

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

2581944 is a wasteful number, since it uses less digits than its factorization.

2581944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107590 (or 107586 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 2581944 is about 1606.8428672400. The cubic root of 2581944 is about 137.1878361890.

The spelling of 2581944 in words is "two million, five hundred eighty-one thousand, nine hundred forty-four".