439393939 has 4 divisors (see below), whose sum is σ = 439928656. Its totient is φ = 438859224.

The previous prime is 439393931. The next prime is 439393957. The reversal of 439393939 is 939393934.

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 439393939 - 2³ = 439393931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (439393931) 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, 266124 + ... + 267769.

It is an arithmetic number, because the mean of its divisors is an integer number (109982164).

Almost surely, 2^439393939 is an apocalyptic number.

439393939 is a deficient number, since it is larger than the sum of its proper divisors (534717).

439393939 is an equidigital number, since it uses as much as digits as its factorization.

439393939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534716.

The product of its digits is 2125764, while the sum is 52.

The square root of 439393939 is about 20961.7255730534. The cubic root of 439393939 is about 760.2411163628.

The spelling of 439393939 in words is "four hundred thirty-nine million, three hundred ninety-three thousand, nine hundred thirty-nine".