981897892 has 24 divisors (see below), whose sum is σ = 1778850360. Its totient is φ = 473679360.

The previous prime is 981897869. The next prime is 981897893. The reversal of 981897892 is 298798189.

It can be written as a sum of positive squares in 4 ways, for example, as 346555456 + 635342436 = 18616^2 + 25206^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 981897892.

It is not an unprimeable number, because it can be changed into a prime (981897893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248718 + ... + 252634.

It is an arithmetic number, because the mean of its divisors is an integer number (74118765).

Almost surely, 2^981897892 is an apocalyptic number.

981897892 is the 15668-th decagonal number.

It is an amenable number.

981897892 is a deficient number, since it is larger than the sum of its proper divisors (796952468).

981897892 is a wasteful number, since it uses less digits than its factorization.

981897892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6111 (or 6109 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 61.

The square root of 981897892 is about 31335.2499910245. The cubic root of 981897892 is about 993.9291837699.

The spelling of 981897892 in words is "nine hundred eighty-one million, eight hundred ninety-seven thousand, eight hundred ninety-two".