427221605 has 8 divisors (see below), whose sum is σ = 522339192. Its totient is φ = 335328448.

The previous prime is 427221601. The next prime is 427221653. The reversal of 427221605 is 506122724.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 132687361 + 294534244 = 11519^2 + 17162^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 427221605 - 2² = 427221601 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 (427221601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 805814 + ... + 806343.

It is an arithmetic number, because the mean of its divisors is an integer number (65292399).

Almost surely, 2^427221605 is an apocalyptic number.

It is an amenable number.

427221605 is a deficient number, since it is larger than the sum of its proper divisors (95117587).

427221605 is a wasteful number, since it uses less digits than its factorization.

427221605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1612215.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 427221605 is about 20669.3397330442. The cubic root of 427221605 is about 753.1550673074.

The spelling of 427221605 in words is "four hundred twenty-seven million, two hundred twenty-one thousand, six hundred five".