181920798 has 24 divisors (see below), whose sum is σ = 394990128. Its totient is φ = 60512832.

The previous prime is 181920797. The next prime is 181920833. The reversal of 181920798 is 897029181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181920797) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1611 + ... + 19142.

It is an arithmetic number, because the mean of its divisors is an integer number (16457922).

Almost surely, 2^181920798 is an apocalyptic number.

181920798 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

181920798 is an abundant number, since it is smaller than the sum of its proper divisors (213069330).

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

181920798 is a wasteful number, since it uses less digits than its factorization.

181920798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21248 (or 21245 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 45.

The square root of 181920798 is about 13487.8018223875. The cubic root of 181920798 is about 566.6228934277.

The spelling of 181920798 in words is "one hundred eighty-one million, nine hundred twenty thousand, seven hundred ninety-eight".