2140644 has 24 divisors (see below), whose sum is σ = 5449248. Its totient is φ = 648640.

The previous prime is 2140637. The next prime is 2140681. The reversal of 2140644 is 4460412.

It is a self number, because there is not a number n which added to its sum of digits gives 2140644.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7977 + ... + 8240.

It is an arithmetic number, because the mean of its divisors is an integer number (227052).

2^2140644 is an apocalyptic number.

It is an amenable number.

2140644 is an abundant number, since it is smaller than the sum of its proper divisors (3308604).

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

2140644 is a wasteful number, since it uses less digits than its factorization.

2140644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16235 (or 16233 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 2140644 is about 1463.0939819437. The cubic root of 2140644 is about 128.8787996903.

Adding to 2140644 its product of nonzero digits (768), we get a palindrome (2141412).

The spelling of 2140644 in words is "two million, one hundred forty thousand, six hundred forty-four".