181803996 has 72 divisors (see below), whose sum is σ = 506613744. Its totient is φ = 54512640.

The previous prime is 181803991. The next prime is 181803997. The reversal of 181803996 is 699308181.

181803996 is a `hidden beast` number, since 181 + 80 + 399 + 6 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181803991) 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, 36046 + ... + 40778.

It is an arithmetic number, because the mean of its divisors is an integer number (7036302).

Almost surely, 2^181803996 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181803996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253306872).

181803996 is an abundant number, since it is smaller than the sum of its proper divisors (324809748).

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

181803996 is a wasteful number, since it uses less digits than its factorization.

181803996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4851 (or 4846 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 181803996 is about 13483.4712147874. The cubic root of 181803996 is about 566.5016009803.

The spelling of 181803996 in words is "one hundred eighty-one million, eight hundred three thousand, nine hundred ninety-six".