439669 has 4 divisors (see below), whose sum is σ = 454860. Its totient is φ = 424480.

The previous prime is 439667. The next prime is 439687. The reversal of 439669 is 966934.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 966934 = 2 ⋅483467.

It can be written as a sum of positive squares in 2 ways, for example, as 237169 + 202500 = 487^2 + 450^2 .

It is a cyclic number.

It is not a de Polignac number, because 439669 - 2¹ = 439667 is a prime.

It is a super-2 number, since 2×439669² = 386617659122, which contains 22 as substring.

It is a Duffinian number.

439669 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (439661) 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, 7552 + ... + 7609.

It is an arithmetic number, because the mean of its divisors is an integer number (113715).

2⁴³⁹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

439669 is a deficient number, since it is larger than the sum of its proper divisors (15191).

439669 is a wasteful number, since it uses less digits than its factorization.

439669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15190.

The product of its digits is 34992, while the sum is 37.

The square root of 439669 is about 663.0754104927. The cubic root of 439669 is about 76.0399720479.

It can be divided in two parts, 4396 and 69, that added together give a triangular number (4465 = T₉₄).

The spelling of 439669 in words is "four hundred thirty-nine thousand, six hundred sixty-nine".