1621444 has 24 divisors (see below), whose sum is σ = 3171168. Its totient is φ = 719040.

The previous prime is 1621439. The next prime is 1621457. The reversal of 1621444 is 4441261.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1464 + ... + 2320.

It is an arithmetic number, because the mean of its divisors is an integer number (132132).

2^1621444 is an apocalyptic number.

It is an amenable number.

1621444 is a deficient number, since it is larger than the sum of its proper divisors (1549724).

1621444 is a wasteful number, since it uses less digits than its factorization.

1621444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915 (or 913 counting only the distinct ones).

The product of its digits is 768, while the sum is 22.

The square root of 1621444 is about 1273.3593365582. The cubic root of 1621444 is about 117.4809143589.

The spelling of 1621444 in words is "one million, six hundred twenty-one thousand, four hundred forty-four".