181973228 has 12 divisors (see below), whose sum is σ = 323851080. Its totient is φ = 89444352.

The previous prime is 181973201. The next prime is 181973249. The reversal of 181973228 is 822379181.

181973228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×181973228² = 66228511417479968, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385301 + ... + 385772.

It is an arithmetic number, because the mean of its divisors is an integer number (26987590).

Almost surely, 2^181973228 is an apocalyptic number.

It is an amenable number.

181973228 is a deficient number, since it is larger than the sum of its proper divisors (141877852).

181973228 is a wasteful number, since it uses less digits than its factorization.

181973228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 771136 (or 771134 counting only the distinct ones).

The product of its digits is 48384, while the sum is 41.

The square root of 181973228 is about 13489.7452904049. The cubic root of 181973228 is about 566.6773222141.

The spelling of 181973228 in words is "one hundred eighty-one million, nine hundred seventy-three thousand, two hundred twenty-eight".