439727989 has 2 divisors, whose sum is σ = 439727990. Its totient is φ = 439727988.

The previous prime is 439727929. The next prime is 439728011. The reversal of 439727989 is 989727934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 433056100 + 6671889 = 20810^2 + 2583^2 .

It is a cyclic number.

It is not a de Polignac number, because 439727989 - 2²⁵ = 406173557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (439727929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219863994 + 219863995.

It is an arithmetic number, because the mean of its divisors is an integer number (219863995).

Almost surely, 2^439727989 is an apocalyptic number.

It is an amenable number.

439727989 is a deficient number, since it is larger than the sum of its proper divisors (1).

439727989 is an equidigital number, since it uses as much as digits as its factorization.

439727989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6858432, while the sum is 58.

The square root of 439727989 is about 20969.6921532005. The cubic root of 439727989 is about 760.4337257671.

Subtracting 439727989 from its reverse (989727934), we obtain a palindrome (549999945).

The spelling of 439727989 in words is "four hundred thirty-nine million, seven hundred twenty-seven thousand, nine hundred eighty-nine".