447390661 has 4 divisors (see below), whose sum is σ = 448370092. Its totient is φ = 446411232.

The previous prime is 447390637. The next prime is 447390673. The reversal of 447390661 is 166093744.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 244328161 + 203062500 = 15631^2 + 14250^2 .

It is a cyclic number.

It is not a de Polignac number, because 447390661 - 2²⁵ = 413836229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (447390611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 489030 + ... + 489943.

It is an arithmetic number, because the mean of its divisors is an integer number (112092523).

Almost surely, 2^447390661 is an apocalyptic number.

It is an amenable number.

447390661 is a deficient number, since it is larger than the sum of its proper divisors (979431).

447390661 is an equidigital number, since it uses as much as digits as its factorization.

447390661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979430.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 447390661 is about 21151.6113097797. The cubic root of 447390661 is about 764.8254039301.

The spelling of 447390661 in words is "four hundred forty-seven million, three hundred ninety thousand, six hundred sixty-one".