427221638 has 8 divisors (see below), whose sum is σ = 641586288. Its totient is φ = 213359544.

The previous prime is 427221601. The next prime is 427221653. The reversal of 427221638 is 836122724.

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

It is a junction number, because it is equal to n+sod(n) for n = 427221598 and 427221607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123506 + ... + 126917.

It is an arithmetic number, because the mean of its divisors is an integer number (80198286).

Almost surely, 2^427221638 is an apocalyptic number.

427221638 is a deficient number, since it is larger than the sum of its proper divisors (214364650).

427221638 is a wasteful number, since it uses less digits than its factorization.

427221638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251278.

The product of its digits is 32256, while the sum is 35.

The square root of 427221638 is about 20669.3405313280. The cubic root of 427221638 is about 753.1550866994.

The spelling of 427221638 in words is "four hundred twenty-seven million, two hundred twenty-one thousand, six hundred thirty-eight".