439749 has 20 divisors (see below), whose sum is σ = 675180. Its totient is φ = 285120.

The previous prime is 439729. The next prime is 439753. The reversal of 439749 is 947934.

It can be written as a sum of positive squares in 2 ways, for example, as 42849 + 396900 = 207^2 + 630^2 .

It is not a de Polignac number, because 439749 - 2⁸ = 439493 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

Its product of digits (27216) is a multiple of the sum of its prime factors (162).

439749 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (439709) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 4897 + ... + 4985.

It is an arithmetic number, because the mean of its divisors is an integer number (33759).

2⁴³⁹⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

439749 is a deficient number, since it is larger than the sum of its proper divisors (235431).

439749 is an equidigital number, since it uses as much as digits as its factorization.

439749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 153 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 439749 is about 663.1357327124. The cubic root of 439749 is about 76.0445837208.

The spelling of 439749 in words is "four hundred thirty-nine thousand, seven hundred forty-nine".