181332738 has 24 divisors (see below), whose sum is σ = 394527276. Its totient is φ = 60192000.

The previous prime is 181332703. The next prime is 181332743. The reversal of 181332738 is 837233181.

181332738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 171950769 + 9381969 = 13113^2 + 3063^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16563 + ... + 25238.

Almost surely, 2^181332738 is an apocalyptic number.

181332738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

181332738 is an abundant number, since it is smaller than the sum of its proper divisors (213194538).

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

181332738 is a wasteful number, since it uses less digits than its factorization.

181332738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42050 (or 42047 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 181332738 is about 13465.9844794207. The cubic root of 181332738 is about 566.0116971616.

The spelling of 181332738 in words is "one hundred eighty-one million, three hundred thirty-two thousand, seven hundred thirty-eight".