447779999 has 2 divisors, whose sum is σ = 447780000. Its totient is φ = 447779998.

The previous prime is 447779989. The next prime is 447780001. The reversal of 447779999 is 999977744.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-447779999 is a prime.

It is a Sophie Germain prime.

Together with 447780001, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (447779909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 223889999 + 223890000.

It is an arithmetic number, because the mean of its divisors is an integer number (223890000).

Almost surely, 2^447779999 is an apocalyptic number.

447779999 is a deficient number, since it is larger than the sum of its proper divisors (1).

447779999 is an equidigital number, since it uses as much as digits as its factorization.

447779999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36006768, while the sum is 65.

The square root of 447779999 is about 21160.8128152016. The cubic root of 447779999 is about 765.0472005849.

The spelling of 447779999 in words is "four hundred forty-seven million, seven hundred seventy-nine thousand, nine hundred ninety-nine".