18958238 has 16 divisors (see below), whose sum is σ = 32237520. Its totient is φ = 8289216.

The previous prime is 18958237. The next prime is 18958241. The reversal of 18958238 is 83285981.

It is a Smith number, since the sum of its digits (44) 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 not an unprimeable number, because it can be changed into a prime (18958231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18695 + ... + 19682.

It is an arithmetic number, because the mean of its divisors is an integer number (2014845).

Almost surely, 2^18958238 is an apocalyptic number.

18958238 is a deficient number, since it is larger than the sum of its proper divisors (13279282).

18958238 is a wasteful number, since it uses less digits than its factorization.

18958238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38411.

The product of its digits is 138240, while the sum is 44.

The square root of 18958238 is about 4354.1058783635. The cubic root of 18958238 is about 266.6445165630.

The spelling of 18958238 in words is "eighteen million, nine hundred fifty-eight thousand, two hundred thirty-eight".