1644464 has 20 divisors (see below), whose sum is σ = 3228960. Its totient is φ = 811200.

The previous prime is 1644451. The next prime is 1644491. The reversal of 1644464 is 4644461.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

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, 614 + ... + 1914.

It is an arithmetic number, because the mean of its divisors is an integer number (161448).

2^1644464 is an apocalyptic number.

It is an amenable number.

1644464 is a deficient number, since it is larger than the sum of its proper divisors (1584496).

1644464 is a wasteful number, since it uses less digits than its factorization.

1644464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388 (or 1382 counting only the distinct ones).

The product of its digits is 9216, while the sum is 29.

The square root of 1644464 is about 1282.3665622590. The cubic root of 1644464 is about 118.0342713822.

The spelling of 1644464 in words is "one million, six hundred forty-four thousand, four hundred sixty-four".