981994805 has 16 divisors (see below), whose sum is σ = 1286971200. Its totient is φ = 713372160.

The previous prime is 981994801. The next prime is 981994807. The reversal of 981994805 is 508499189.

It is not a de Polignac number, because 981994805 - 2² = 981994801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981994801) 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 15 ways as a sum of consecutive naturals, for example, 41486 + ... + 60704.

It is an arithmetic number, because the mean of its divisors is an integer number (80435700).

Almost surely, 2^981994805 is an apocalyptic number.

It is an amenable number.

981994805 is a deficient number, since it is larger than the sum of its proper divisors (304976395).

981994805 is a wasteful number, since it uses less digits than its factorization.

981994805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20164.

The product of its (nonzero) digits is 933120, while the sum is 53.

The square root of 981994805 is about 31336.7963423194. The cubic root of 981994805 is about 993.9618828556.

The spelling of 981994805 in words is "nine hundred eighty-one million, nine hundred ninety-four thousand, eight hundred five".