426638 has 4 divisors (see below), whose sum is σ = 639960. Its totient is φ = 213318.

The previous prime is 426637. The next prime is 426641. The reversal of 426638 is 836624.

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

It is a self number, because there is not a number n which added to its sum of digits gives 426638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106658 + ... + 106661.

It is an arithmetic number, because the mean of its divisors is an integer number (159990).

2⁴²⁶⁶³⁸ is an apocalyptic number.

426638 is a deficient number, since it is larger than the sum of its proper divisors (213322).

426638 is a wasteful number, since it uses less digits than its factorization.

426638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213321.

The product of its digits is 6912, while the sum is 29.

The square root of 426638 is about 653.1753210280. The cubic root of 426638 is about 75.2811962498.

The spelling of 426638 in words is "four hundred twenty-six thousand, six hundred thirty-eight".