439199989 has 2 divisors, whose sum is σ = 439199990. Its totient is φ = 439199988.

The previous prime is 439199987. The next prime is 439200017. The reversal of 439199989 is 989991934.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393704964 + 45495025 = 19842^2 + 6745^2 .

It is a cyclic number.

It is not a de Polignac number, because 439199989 - 2¹ = 439199987 is a prime.

Together with 439199987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (439199987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219599994 + 219599995.

It is an arithmetic number, because the mean of its divisors is an integer number (219599995).

Almost surely, 2^439199989 is an apocalyptic number.

It is an amenable number.

439199989 is a deficient number, since it is larger than the sum of its proper divisors (1).

439199989 is an equidigital number, since it uses as much as digits as its factorization.

439199989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5668704, while the sum is 61.

The square root of 439199989 is about 20957.0987734467. The cubic root of 439199989 is about 760.1292422171.

The spelling of 439199989 in words is "four hundred thirty-nine million, one hundred ninety-nine thousand, nine hundred eighty-nine".