439916389 has 4 divisors (see below), whose sum is σ = 479908800. Its totient is φ = 399923980.

The previous prime is 439916387. The next prime is 439916401. The reversal of 439916389 is 983619934.

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 439916389 - 2¹ = 439916387 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 (439916387) 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, 19996189 + ... + 19996210.

It is an arithmetic number, because the mean of its divisors is an integer number (119977200).

Almost surely, 2^439916389 is an apocalyptic number.

It is an amenable number.

439916389 is a deficient number, since it is larger than the sum of its proper divisors (39992411).

439916389 is a wasteful number, since it uses less digits than its factorization.

439916389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39992410.

The product of its digits is 1259712, while the sum is 52.

The square root of 439916389 is about 20974.1838697004. The cubic root of 439916389 is about 760.5423120309.

The spelling of 439916389 in words is "four hundred thirty-nine million, nine hundred sixteen thousand, three hundred eighty-nine".