1639144 has 16 divisors (see below), whose sum is σ = 3310020. Its totient is φ = 756480.

The previous prime is 1639097. The next prime is 1639147. The reversal of 1639144 is 4419361.

It can be written as a sum of positive squares in 2 ways, for example, as 1612900 + 26244 = 1270^2 + 162^2 .

It is not an unprimeable number, because it can be changed into a prime (1639147) 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, 7777 + ... + 7984.

2^1639144 is an apocalyptic number.

It is an amenable number.

1639144 is an abundant number, since it is smaller than the sum of its proper divisors (1670876).

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

1639144 is a wasteful number, since it uses less digits than its factorization.

1639144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15780 (or 15776 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 1639144 is about 1280.2905920142. The cubic root of 1639144 is about 117.9068497837.

The spelling of 1639144 in words is "one million, six hundred thirty-nine thousand, one hundred forty-four".