181212030 has 48 divisors (see below), whose sum is σ = 473316480. Its totient is φ = 48101184.

The previous prime is 181212023. The next prime is 181212041. The reversal of 181212030 is 30212181.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 181211994 and 181212012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15556 + ... + 24584.

It is an arithmetic number, because the mean of its divisors is an integer number (9860760).

Almost surely, 2^181212030 is an apocalyptic number.

181212030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 181212030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236658240).

181212030 is an abundant number, since it is smaller than the sum of its proper divisors (292104450).

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

181212030 is a wasteful number, since it uses less digits than its factorization.

181212030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9265 (or 9262 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 181212030 is about 13461.5017735764. The cubic root of 181212030 is about 565.8860767021.

The spelling of 181212030 in words is "one hundred eighty-one million, two hundred twelve thousand, thirty".