18968238 has 24 divisors (see below), whose sum is σ = 42885648. Its totient is φ = 6047712.

The previous prime is 18968231. The next prime is 18968317. The reversal of 18968238 is 83286981.

It is a junction number, because it is equal to n+sod(n) for n = 18968193 and 18968202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18968231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22495 + ... + 23322.

It is an arithmetic number, because the mean of its divisors is an integer number (1786902).

Almost surely, 2^18968238 is an apocalyptic number.

18968238 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18968238 is an abundant number, since it is smaller than the sum of its proper divisors (23917410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18968238 is a wasteful number, since it uses less digits than its factorization.

18968238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45848 (or 45845 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 18968238 is about 4355.2540683639. The cubic root of 18968238 is about 266.6913911103.

It can be divided in two parts, 18 and 968238, that added together give a square (968256 = 984²).

The spelling of 18968238 in words is "eighteen million, nine hundred sixty-eight thousand, two hundred thirty-eight".