422638 has 4 divisors (see below), whose sum is σ = 633960. Its totient is φ = 211318.

The previous prime is 422627. The next prime is 422657. The reversal of 422638 is 836224.

It is a happy number.

422638 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

422638 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105658 + ... + 105661.

It is an arithmetic number, because the mean of its divisors is an integer number (158490).

2⁴²²⁶³⁸ is an apocalyptic number.

422638 is a deficient number, since it is larger than the sum of its proper divisors (211322).

422638 is a wasteful number, since it uses less digits than its factorization.

422638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211321.

The product of its digits is 2304, while the sum is 25.

The square root of 422638 is about 650.1061451794. The cubic root of 422638 is about 75.0451875838.

The spelling of 422638 in words is "four hundred twenty-two thousand, six hundred thirty-eight".