181984890 has 16 divisors (see below), whose sum is σ = 436763808. Its totient is φ = 48529296.

The previous prime is 181984879. The next prime is 181984919. The reversal of 181984890 is 98489181.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3033052 + ... + 3033111.

It is an arithmetic number, because the mean of its divisors is an integer number (27297738).

Almost surely, 2^181984890 is an apocalyptic number.

181984890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181984890 is an abundant number, since it is smaller than the sum of its proper divisors (254778918).

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

181984890 is a wasteful number, since it uses less digits than its factorization.

181984890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6066173.

The product of its (nonzero) digits is 165888, while the sum is 48.

The square root of 181984890 is about 13490.1775377495. The cubic root of 181984890 is about 566.6894273826.

The spelling of 181984890 in words is "one hundred eighty-one million, nine hundred eighty-four thousand, eight hundred ninety".