181972330 has 16 divisors (see below), whose sum is σ = 328800384. Its totient is φ = 72511120.

The previous prime is 181972321. The next prime is 181972379. The reversal of 181972330 is 33279181.

It is a super-2 number, since 2×181972330² = 66227857771257800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31966 + ... + 37225.

It is an arithmetic number, because the mean of its divisors is an integer number (20550024).

Almost surely, 2^181972330 is an apocalyptic number.

181972330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181972330 is a deficient number, since it is larger than the sum of its proper divisors (146828054).

181972330 is a wasteful number, since it uses less digits than its factorization.

181972330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69461.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 181972330 is about 13489.7120058213. The cubic root of 181972330 is about 566.6763900677.

The spelling of 181972330 in words is "one hundred eighty-one million, nine hundred seventy-two thousand, three hundred thirty".