2291644 has 12 divisors (see below), whose sum is σ = 4139968. Its totient is φ = 1108800.

The previous prime is 2291629. The next prime is 2291657. The reversal of 2291644 is 4461922.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

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, 9117 + ... + 9364.

2^2291644 is an apocalyptic number.

It is an amenable number.

2291644 is a deficient number, since it is larger than the sum of its proper divisors (1848324).

2291644 is a wasteful number, since it uses less digits than its factorization.

2291644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18516 (or 18514 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 2291644 is about 1513.8176904766. The cubic root of 2291644 is about 131.8405635472.

The spelling of 2291644 in words is "two million, two hundred ninety-one thousand, six hundred forty-four".