427221665 has 16 divisors (see below), whose sum is σ = 576108288. Its totient is φ = 301768896.

The previous prime is 427221661. The next prime is 427221673. The reversal of 427221665 is 566122724.

It is not a de Polignac number, because 427221665 - 2² = 427221661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (427221661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141389 + ... + 144378.

It is an arithmetic number, because the mean of its divisors is an integer number (36006768).

Almost surely, 2^427221665 is an apocalyptic number.

It is an amenable number.

427221665 is a deficient number, since it is larger than the sum of its proper divisors (148886623).

427221665 is a wasteful number, since it uses less digits than its factorization.

427221665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285808.

The product of its digits is 40320, while the sum is 35.

The square root of 427221665 is about 20669.3411844693. The cubic root of 427221665 is about 753.1551025657.

The spelling of 427221665 in words is "four hundred twenty-seven million, two hundred twenty-one thousand, six hundred sixty-five".