181492272 has 160 divisors (see below), whose sum is σ = 594336960. Its totient is φ = 52531200.

The previous prime is 181492249. The next prime is 181492279. The reversal of 181492272 is 272294181.

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

It is not an unprimeable number, because it can be changed into a prime (181492279) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94522 + ... + 96422.

It is an arithmetic number, because the mean of its divisors is an integer number (3714606).

Almost surely, 2^181492272 is an apocalyptic number.

181492272 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 181492272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297168480).

181492272 is an abundant number, since it is smaller than the sum of its proper divisors (412844688).

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

181492272 is a wasteful number, since it uses less digits than its factorization.

181492272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948 (or 1936 counting only the distinct ones).

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

The square root of 181492272 is about 13471.9067692736. The cubic root of 181492272 is about 566.1776382248.

The spelling of 181492272 in words is "one hundred eighty-one million, four hundred ninety-two thousand, two hundred seventy-two".