447989987 has 2 divisors, whose sum is σ = 447989988. Its totient is φ = 447989986.

The previous prime is 447989963. The next prime is 447989989. The reversal of 447989987 is 789989744.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 447989987 - 2²² = 443795683 is a prime.

Together with 447989989, 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 (447989989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 223994993 + 223994994.

It is an arithmetic number, because the mean of its divisors is an integer number (223994994).

Almost surely, 2^447989987 is an apocalyptic number.

447989987 is a deficient number, since it is larger than the sum of its proper divisors (1).

447989987 is an equidigital number, since it uses as much as digits as its factorization.

447989987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36578304, while the sum is 65.

The square root of 447989987 is about 21165.7739523033. The cubic root of 447989987 is about 765.1667724177.

The spelling of 447989987 in words is "four hundred forty-seven million, nine hundred eighty-nine thousand, nine hundred eighty-seven".