338638 has 4 divisors (see below), whose sum is σ = 507960. Its totient is φ = 169318.

The previous prime is 338609. The next prime is 338659. The reversal of 338638 is 836833.

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

It is a super-2 number, since 2×338638² = 229351390088, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84658 + ... + 84661.

It is an arithmetic number, because the mean of its divisors is an integer number (126990).

2³³⁸⁶³⁸ is an apocalyptic number.

338638 is a deficient number, since it is larger than the sum of its proper divisors (169322).

338638 is a wasteful number, since it uses less digits than its factorization.

338638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169321.

The product of its digits is 10368, while the sum is 31.

The square root of 338638 is about 581.9261121483. The cubic root of 338638 is about 69.7019984648.

The spelling of 338638 in words is "three hundred thirty-eight thousand, six hundred thirty-eight".