2091644 has 12 divisors (see below), whose sum is σ = 3670800. Its totient is φ = 1042848.

The previous prime is 2091637. The next prime is 2091659. The reversal of 2091644 is 4461902.

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, 1817 + ... + 2735.

It is an arithmetic number, because the mean of its divisors is an integer number (305900).

2^2091644 is an apocalyptic number.

It is an amenable number.

2091644 is a deficient number, since it is larger than the sum of its proper divisors (1579156).

2091644 is a wasteful number, since it uses less digits than its factorization.

2091644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492 (or 1490 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 2091644 is about 1446.2517069999. The cubic root of 2091644 is about 127.8878412037.

The spelling of 2091644 in words is "two million, ninety-one thousand, six hundred forty-four".