981646188 has 12 divisors (see below), whose sum is σ = 2290507800. Its totient is φ = 327215392.

The previous prime is 981646157. The next prime is 981646199. The reversal of 981646188 is 881646189.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 981646188.

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, 40901913 + ... + 40901936.

It is an arithmetic number, because the mean of its divisors is an integer number (190875650).

Almost surely, 2^981646188 is an apocalyptic number.

It is an amenable number.

981646188 is an abundant number, since it is smaller than the sum of its proper divisors (1308861612).

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

981646188 is a wasteful number, since it uses less digits than its factorization.

981646188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81803856 (or 81803854 counting only the distinct ones).

The product of its digits is 663552, while the sum is 51.

The square root of 981646188 is about 31331.2334260878. The cubic root of 981646188 is about 993.8442471272.

Subtracting from 981646188 its reverse (881646189), we obtain a palindrome (99999999).

The spelling of 981646188 in words is "nine hundred eighty-one million, six hundred forty-six thousand, one hundred eighty-eight".