198083781 has 24 divisors (see below), whose sum is σ = 327525120. Its totient is φ = 113007456.

The previous prime is 198083773. The next prime is 198083783. The reversal of 198083781 is 187380891.

198083781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 198083781 - 2³ = 198083773 is a prime.

It is a super-2 number, since 2×198083781² = 78474368590511922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198083783) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43111 + ... + 47483.

It is an arithmetic number, because the mean of its divisors is an integer number (13646880).

Almost surely, 2^198083781 is an apocalyptic number.

It is an amenable number.

198083781 is a deficient number, since it is larger than the sum of its proper divisors (129441339).

198083781 is a wasteful number, since it uses less digits than its factorization.

198083781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5105 (or 5102 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 45.

The square root of 198083781 is about 14074.2239928175. The cubic root of 198083781 is about 582.9298647471.

The spelling of 198083781 in words is "one hundred ninety-eight million, eighty-three thousand, seven hundred eighty-one".