181913998 has 16 divisors (see below), whose sum is σ = 313659360. Its totient is φ = 77511456.

The previous prime is 181913981. The next prime is 181914001. The reversal of 181913998 is 899319181.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35133 + ... + 39976.

It is an arithmetic number, because the mean of its divisors is an integer number (19603710).

Almost surely, 2^181913998 is an apocalyptic number.

181913998 is a deficient number, since it is larger than the sum of its proper divisors (131745362).

181913998 is a wasteful number, since it uses less digits than its factorization.

181913998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75291.

The product of its digits is 139968, while the sum is 49.

The square root of 181913998 is about 13487.5497404087. The cubic root of 181913998 is about 566.6158334255.

The spelling of 181913998 in words is "one hundred eighty-one million, nine hundred thirteen thousand, nine hundred ninety-eight".