181914228 has 48 divisors (see below), whose sum is σ = 479640000. Its totient is φ = 59608224.

The previous prime is 181914223. The next prime is 181914233. The reversal of 181914228 is 822419181.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (181914223) and next prime (181914233).

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

It is a junction number, because it is equal to n+sod(n) for n = 181914192 and 181914201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181914221) 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, 7903 + ... + 20646.

It is an arithmetic number, because the mean of its divisors is an integer number (9992500).

Almost surely, 2^181914228 is an apocalyptic number.

181914228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

181914228 is an abundant number, since it is smaller than the sum of its proper divisors (297725772).

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

181914228 is a wasteful number, since it uses less digits than its factorization.

181914228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28621 (or 28613 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 181914228 is about 13487.5582667880. The cubic root of 181914228 is about 566.6160722226.

The spelling of 181914228 in words is "one hundred eighty-one million, nine hundred fourteen thousand, two hundred twenty-eight".