2639944 has 8 divisors (see below), whose sum is σ = 4949910. Its totient is φ = 1319968.

The previous prime is 2639941. The next prime is 2639953. The reversal of 2639944 is 4499362.

It can be written as a sum of positive squares in only one way, i.e., 1562500 + 1077444 = 1250^2 + 1038^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2639941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164989 + ... + 165004.

2^2639944 is an apocalyptic number.

It is an amenable number.

2639944 is a deficient number, since it is larger than the sum of its proper divisors (2309966).

2639944 is a wasteful number, since it uses less digits than its factorization.

2639944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329999 (or 329995 counting only the distinct ones).

The product of its digits is 46656, while the sum is 37.

The square root of 2639944 is about 1624.7904480271. The cubic root of 2639944 is about 138.2074873617.

The spelling of 2639944 in words is "two million, six hundred thirty-nine thousand, nine hundred forty-four".