427221639 has 12 divisors (see below), whose sum is σ = 664567176. Its totient is φ = 262905552.

The previous prime is 427221601. The next prime is 427221653. The reversal of 427221639 is 936122724.

427221639 is a `hidden beast` number, since 427 + 221 + 6 + 3 + 9 = 666.

It is not a de Polignac number, because 427221639 - 2⁷ = 427221511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427221139) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1825617 + ... + 1825850.

It is an arithmetic number, because the mean of its divisors is an integer number (55380598).

Almost surely, 2^427221639 is an apocalyptic number.

427221639 is a deficient number, since it is larger than the sum of its proper divisors (237345537).

427221639 is a wasteful number, since it uses less digits than its factorization.

427221639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3651486 (or 3651483 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 427221639 is about 20669.3405555185. The cubic root of 427221639 is about 753.1550872871.

The spelling of 427221639 in words is "four hundred twenty-seven million, two hundred twenty-one thousand, six hundred thirty-nine".