181873338 has 16 divisors (see below), whose sum is σ = 364287456. Its totient is φ = 60534320.

The previous prime is 181873337. The next prime is 181873381. The reversal of 181873338 is 833378181.

It is a super-2 number, since 2×181873338² = 66155822150524488, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 181873338.

It is not an unprimeable number, because it can be changed into a prime (181873331) 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, 18093 + ... + 26288.

It is an arithmetic number, because the mean of its divisors is an integer number (22767966).

Almost surely, 2^181873338 is an apocalyptic number.

181873338 is an abundant number, since it is smaller than the sum of its proper divisors (182414118).

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

181873338 is a wasteful number, since it uses less digits than its factorization.

181873338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45069.

The product of its digits is 96768, while the sum is 42.

The square root of 181873338 is about 13486.0423401382. The cubic root of 181873338 is about 566.5736150939.

The spelling of 181873338 in words is "one hundred eighty-one million, eight hundred seventy-three thousand, three hundred thirty-eight".