1622644 has 12 divisors (see below), whose sum is σ = 2879044. Its totient is φ = 800064.

The previous prime is 1622641. The next prime is 1622659. The reversal of 1622644 is 4462261.

It can be written as a sum of positive squares in 2 ways, for example, as 1276900 + 345744 = 1130^2 + 588^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1622641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2487 + ... + 3070.

2^1622644 is an apocalyptic number.

It is an amenable number.

1622644 is a deficient number, since it is larger than the sum of its proper divisors (1256400).

1622644 is a wasteful number, since it uses less digits than its factorization.

1622644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5634 (or 5632 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

The square root of 1622644 is about 1273.8304439760. The cubic root of 1622644 is about 117.5098890123.

The spelling of 1622644 in words is "one million, six hundred twenty-two thousand, six hundred forty-four".