338918638 has 4 divisors (see below), whose sum is σ = 508377960. Its totient is φ = 169459318.

The previous prime is 338918627. The next prime is 338918653. The reversal of 338918638 is 836819833.

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

It is a super-2 number, since 2×338918638² = 229731686367550088, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 338918591 and 338918600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84729658 + ... + 84729661.

It is an arithmetic number, because the mean of its divisors is an integer number (127094490).

Almost surely, 2^338918638 is an apocalyptic number.

338918638 is a deficient number, since it is larger than the sum of its proper divisors (169459322).

338918638 is a wasteful number, since it uses less digits than its factorization.

338918638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169459321.

The product of its digits is 746496, while the sum is 49.

The square root of 338918638 is about 18409.7430183042. The cubic root of 338918638 is about 697.2124775983.

The spelling of 338918638 in words is "three hundred thirty-eight million, nine hundred eighteen thousand, six hundred thirty-eight".