1321644 has 24 divisors (see below), whose sum is σ = 3103408. Its totient is φ = 437760.

The previous prime is 1321637. The next prime is 1321651. The reversal of 1321644 is 4461231.

It is an interprime number because it is at equal distance from previous prime (1321637) and next prime (1321651).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1321644.

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, 2664 + ... + 3120.

2^1321644 is an apocalyptic number.

It is an amenable number.

1321644 is an abundant number, since it is smaller than the sum of its proper divisors (1781764).

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

1321644 is a wasteful number, since it uses less digits than its factorization.

1321644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705 (or 703 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

The square root of 1321644 is about 1149.6277658442. The cubic root of 1321644 is about 109.7416526705.

Adding to 1321644 its reverse (4461231), we get a palindrome (5782875).

The spelling of 1321644 in words is "one million, three hundred twenty-one thousand, six hundred forty-four".