439993 has 4 divisors (see below), whose sum is σ = 447268. Its totient is φ = 432720.

The previous prime is 439991. The next prime is 440009. The reversal of 439993 is 399934.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 399934 = 2 ⋅199967.

It can be written as a sum of positive squares in 2 ways, for example, as 166464 + 273529 = 408^2 + 523^2 .

It is a cyclic number.

It is not a de Polignac number, because 439993 - 2¹ = 439991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (439991) 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, 3546 + ... + 3667.

It is an arithmetic number, because the mean of its divisors is an integer number (111817).

2⁴³⁹⁹⁹³ is an apocalyptic number.

It is an amenable number.

439993 is a deficient number, since it is larger than the sum of its proper divisors (7275).

439993 is an equidigital number, since it uses as much as digits as its factorization.

439993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7274.

The product of its digits is 26244, while the sum is 37.

The square root of 439993 is about 663.3196816016. The cubic root of 439993 is about 76.0586458696.

The spelling of 439993 in words is "four hundred thirty-nine thousand, nine hundred ninety-three".