181428138 has 12 divisors (see below), whose sum is σ = 393094338. Its totient is φ = 60476040.

The previous prime is 181428119. The next prime is 181428179. The reversal of 181428138 is 831824181.

It can be written as a sum of positive squares in only one way, i.e., 110817729 + 70610409 = 10527^2 + 8403^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5039653 + ... + 5039688.

Almost surely, 2^181428138 is an apocalyptic number.

181428138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

181428138 is an abundant number, since it is smaller than the sum of its proper divisors (211666200).

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

181428138 is a wasteful number, since it uses less digits than its factorization.

181428138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10079349 (or 10079346 counting only the distinct ones).

The product of its digits is 12288, while the sum is 36.

The square root of 181428138 is about 13469.5262722933. The cubic root of 181428138 is about 566.1109402249.

The spelling of 181428138 in words is "one hundred eighty-one million, four hundred twenty-eight thousand, one hundred thirty-eight".