181994928 has 80 divisors (see below), whose sum is σ = 500253696. Its totient is φ = 56816640.

The previous prime is 181994927. The next prime is 181994959. The reversal of 181994928 is 829499181.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (181994927) 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, 220725 + ... + 221547.

Almost surely, 2^181994928 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 181994928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250126848).

181994928 is an abundant number, since it is smaller than the sum of its proper divisors (318258768).

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

181994928 is a wasteful number, since it uses less digits than its factorization.

181994928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122 (or 1116 counting only the distinct ones).

The product of its digits is 373248, while the sum is 51.

The square root of 181994928 is about 13490.5495810956. The cubic root of 181994928 is about 566.6998464232.

The spelling of 181994928 in words is "one hundred eighty-one million, nine hundred ninety-four thousand, nine hundred twenty-eight".