181816040 has 64 divisors (see below), whose sum is σ = 478431360. Its totient is φ = 60883200.

The previous prime is 181816021. The next prime is 181816043. The reversal of 181816040 is 40618181.

181816040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 181815994 and 181816012.

It is not an unprimeable number, because it can be changed into a prime (181816043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4490 + ... + 19590.

It is an arithmetic number, because the mean of its divisors is an integer number (7475490).

Almost surely, 2^181816040 is an apocalyptic number.

181816040 is a gapful number since it is divisible by the number (10) 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 181816040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239215680).

181816040 is an abundant number, since it is smaller than the sum of its proper divisors (296615320).

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

181816040 is a wasteful number, since it uses less digits than its factorization.

181816040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15162 (or 15158 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 181816040 is about 13483.9178282871. The cubic root of 181816040 is about 566.5141104132.

The spelling of 181816040 in words is "one hundred eighty-one million, eight hundred sixteen thousand, forty".