1639441 has 4 divisors (see below), whose sum is σ = 1642212. Its totient is φ = 1636672.

The previous prime is 1639427. The next prime is 1639459. The reversal of 1639441 is 1449361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1476225 + 163216 = 1215^2 + 404^2 .

It is a cyclic number.

It is not a de Polignac number, because 1639441 - 2⁵ = 1639409 is a prime.

It is a Duffinian number.

1639441 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1639471) 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, 100 + ... + 1813.

It is an arithmetic number, because the mean of its divisors is an integer number (410553).

2^1639441 is an apocalyptic number.

It is an amenable number.

1639441 is a deficient number, since it is larger than the sum of its proper divisors (2771).

1639441 is an equidigital number, since it uses as much as digits as its factorization.

1639441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2770.

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

The square root of 1639441 is about 1280.4065760531. The cubic root of 1639441 is about 117.9139706182.

It can be divided in two parts, 1639 and 441, that added together give a triangular number (2080 = T₆₄).

The spelling of 1639441 in words is "one million, six hundred thirty-nine thousand, four hundred forty-one".