447923661 has 4 divisors (see below), whose sum is σ = 597231552. Its totient is φ = 298615772.

The previous prime is 447923657. The next prime is 447923687. The reversal of 447923661 is 166329744.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 447923661 - 2² = 447923657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (447923611) 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, 74653941 + ... + 74653946.

It is an arithmetic number, because the mean of its divisors is an integer number (149307888).

Almost surely, 2^447923661 is an apocalyptic number.

It is an amenable number.

447923661 is a deficient number, since it is larger than the sum of its proper divisors (149307891).

447923661 is a wasteful number, since it uses less digits than its factorization.

447923661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149307890.

The product of its digits is 217728, while the sum is 42.

The square root of 447923661 is about 21164.2070723191. The cubic root of 447923661 is about 765.1290089575.

The spelling of 447923661 in words is "four hundred forty-seven million, nine hundred twenty-three thousand, six hundred sixty-one".