181983638 has 8 divisors (see below), whose sum is σ = 273032760. Its totient is φ = 90972720.

The previous prime is 181983619. The next prime is 181983643. The reversal of 181983638 is 836389181.

It is a happy number.

181983638 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 181983592 and 181983601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13178 + ... + 23186.

It is an arithmetic number, because the mean of its divisors is an integer number (34129095).

Almost surely, 2^181983638 is an apocalyptic number.

181983638 is a deficient number, since it is larger than the sum of its proper divisors (91049122).

181983638 is a wasteful number, since it uses less digits than its factorization.

181983638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19102.

The product of its digits is 248832, while the sum is 47.

The square root of 181983638 is about 13490.1311335361. The cubic root of 181983638 is about 566.6881278300.

The spelling of 181983638 in words is "one hundred eighty-one million, nine hundred eighty-three thousand, six hundred thirty-eight".