181940190 has 16 divisors (see below), whose sum is σ = 436656528. Its totient is φ = 48517376.

The previous prime is 181940183. The next prime is 181940191. The reversal of 181940190 is 91049181.

It is a super-2 number, since 2×181940190² = 66204465474472200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181940191) by changing a digit.

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, 3032307 + ... + 3032366.

It is an arithmetic number, because the mean of its divisors is an integer number (27291033).

Almost surely, 2^181940190 is an apocalyptic number.

181940190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181940190 is an abundant number, since it is smaller than the sum of its proper divisors (254716338).

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

181940190 is a wasteful number, since it uses less digits than its factorization.

181940190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6064683.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 181940190 is about 13488.5206750036. The cubic root of 181940190 is about 566.6430259265.

The spelling of 181940190 in words is "one hundred eighty-one million, nine hundred forty thousand, one hundred ninety".