181229472 has 144 divisors (see below), whose sum is σ = 543449088. Its totient is φ = 57208320.

The previous prime is 181229459. The next prime is 181229473. The reversal of 181229472 is 274922181.

181229472 is a `hidden beast` number, since 181 + 2 + 2 + 9 + 472 = 666.

181229472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181229473) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 472993 + ... + 473375.

It is an arithmetic number, because the mean of its divisors is an integer number (3773952).

Almost surely, 2^181229472 is an apocalyptic number.

181229472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181229472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271724544).

181229472 is an abundant number, since it is smaller than the sum of its proper divisors (362219616).

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

181229472 is a wasteful number, since it uses less digits than its factorization.

181229472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483 (or 472 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 181229472 is about 13462.1496054679. The cubic root of 181229472 is about 565.9042319874.

The spelling of 181229472 in words is "one hundred eighty-one million, two hundred twenty-nine thousand, four hundred seventy-two".