439643 has 4 divisors (see below), whose sum is σ = 450408. Its totient is φ = 428880.

The previous prime is 439639. The next prime is 439661. The reversal of 439643 is 346934.

It is a happy number.

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 439643 - 2² = 439639 is a prime.

It is a d-powerful number, because it can be written as 4⁴ + 3⁴ + 6 + 9 + 4⁹ + 3¹¹ .

It is a Duffinian number.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (439613) 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, 5321 + ... + 5402.

It is an arithmetic number, because the mean of its divisors is an integer number (112602).

2⁴³⁹⁶⁴³ is an apocalyptic number.

439643 is a deficient number, since it is larger than the sum of its proper divisors (10765).

439643 is a wasteful number, since it uses less digits than its factorization.

439643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10764.

The product of its digits is 7776, while the sum is 29.

The square root of 439643 is about 663.0558045896. The cubic root of 439643 is about 76.0384731337.

The spelling of 439643 in words is "four hundred thirty-nine thousand, six hundred forty-three".