544639 has 4 divisors (see below), whose sum is σ = 562240. Its totient is φ = 527040.

The previous prime is 544631. The next prime is 544651. The reversal of 544639 is 936445.

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

It is a cyclic number.

It is not a de Polignac number, because 544639 - 2³ = 544631 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 17569 = 544639 / (5 + 4 + 4 + 6 + 3 + 9).

It is a Duffinian number.

544639 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 544639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (544631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8754 + ... + 8815.

It is an arithmetic number, because the mean of its divisors is an integer number (140560).

2⁵⁴⁴⁶³⁹ is an apocalyptic number.

544639 is a deficient number, since it is larger than the sum of its proper divisors (17601).

544639 is a wasteful number, since it uses less digits than its factorization.

544639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17600.

The product of its digits is 12960, while the sum is 31.

The square root of 544639 is about 737.9966124583. The cubic root of 544639 is about 81.6650524925.

It can be divided in two parts, 5 and 44639, that added together give a palindrome (44644).

The spelling of 544639 in words is "five hundred forty-four thousand, six hundred thirty-nine".