2231644 has 24 divisors (see below), whose sum is σ = 4128768. Its totient is φ = 1053360.

The previous prime is 2231627. The next prime is 2231653. The reversal of 2231644 is 4461322.

It is a happy number.

It is a super-3 number, since 3×2231644³ = 33342334285641413952, which contains 333 as substring.

It is an Ulam number.

It is a congruent number.

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, 11589 + ... + 11779.

It is an arithmetic number, because the mean of its divisors is an integer number (172032).

2^2231644 is an apocalyptic number.

It is an amenable number.

2231644 is a deficient number, since it is larger than the sum of its proper divisors (1897124).

2231644 is a wasteful number, since it uses less digits than its factorization.

2231644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345 (or 343 counting only the distinct ones).

The product of its digits is 1152, while the sum is 22.

The square root of 2231644 is about 1493.8688028070. The cubic root of 2231644 is about 130.6797530741.

Adding to 2231644 its reverse (4461322), we get a palindrome (6692966).

The spelling of 2231644 in words is "two million, two hundred thirty-one thousand, six hundred forty-four".