439813 has 4 divisors (see below), whose sum is σ = 479808. Its totient is φ = 399820.

The previous prime is 439811. The next prime is 439823. The reversal of 439813 is 318934.

439813 is nontrivially palindromic in base 7.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 439813 - 2¹ = 439811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (439811) 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, 19981 + ... + 20002.

It is an arithmetic number, because the mean of its divisors is an integer number (119952).

2⁴³⁹⁸¹³ is an apocalyptic number.

It is an amenable number.

439813 is a deficient number, since it is larger than the sum of its proper divisors (39995).

439813 is a wasteful number, since it uses less digits than its factorization.

439813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39994.

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

The square root of 439813 is about 663.1839865377. The cubic root of 439813 is about 76.0482726564.

The spelling of 439813 in words is "four hundred thirty-nine thousand, eight hundred thirteen".