181819836 has 96 divisors (see below), whose sum is σ = 530933760. Its totient is φ = 53308800.

The previous prime is 181819831. The next prime is 181819849. The reversal of 181819836 is 638918181.

It is a junction number, because it is equal to n+sod(n) for n = 181819791 and 181819800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181819831) 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, 34360 + ... + 39296.

It is an arithmetic number, because the mean of its divisors is an integer number (5530560).

Almost surely, 2^181819836 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 181819836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (265466880).

181819836 is an abundant number, since it is smaller than the sum of its proper divisors (349113924).

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

181819836 is a wasteful number, since it uses less digits than its factorization.

181819836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4992 (or 4984 counting only the distinct ones).

The product of its digits is 82944, while the sum is 45.

The square root of 181819836 is about 13484.0585878288. The cubic root of 181819836 is about 566.5180529927.

The spelling of 181819836 in words is "one hundred eighty-one million, eight hundred nineteen thousand, eight hundred thirty-six".