439199987 has 2 divisors, whose sum is σ = 439199988. Its totient is φ = 439199986.

The previous prime is 439199911. The next prime is 439199989. The reversal of 439199987 is 789991934.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 439199987 - 2¹² = 439195891 is a prime.

Together with 439199989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (439199989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219599993 + 219599994.

It is an arithmetic number, because the mean of its divisors is an integer number (219599994).

Almost surely, 2^439199987 is an apocalyptic number.

439199987 is a deficient number, since it is larger than the sum of its proper divisors (1).

439199987 is an equidigital number, since it uses as much as digits as its factorization.

439199987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992, while the sum is 59.

The square root of 439199987 is about 20957.0987257301. The cubic root of 439199987 is about 760.1292410633.

The spelling of 439199987 in words is "four hundred thirty-nine million, one hundred ninety-nine thousand, nine hundred eighty-seven".