181997412 has 24 divisors (see below), whose sum is σ = 424931136. Its totient is φ = 60627168.

The previous prime is 181997411. The next prime is 181997419. The reversal of 181997412 is 214799181.

181997412 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (181997411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19833 + ... + 27519.

It is an arithmetic number, because the mean of its divisors is an integer number (17705464).

Almost surely, 2^181997412 is an apocalyptic number.

181997412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

181997412 is an abundant number, since it is smaller than the sum of its proper divisors (242933724).

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

181997412 is a wasteful number, since it uses less digits than its factorization.

181997412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9667 (or 9665 counting only the distinct ones).

The product of its digits is 36288, while the sum is 42.

The square root of 181997412 is about 13490.6416452295. The cubic root of 181997412 is about 566.7024246563.

The spelling of 181997412 in words is "one hundred eighty-one million, nine hundred ninety-seven thousand, four hundred twelve".