981918 has 24 divisors (see below), whose sum is σ = 2431728. Its totient is φ = 280512.

The previous prime is 981913. The next prime is 981919. The reversal of 981918 is 819189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981913) by changing a digit.

981918 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3771 + ... + 4022.

It is an arithmetic number, because the mean of its divisors is an integer number (101322).

2⁹⁸¹⁹¹⁸ is an apocalyptic number.

981918 is an abundant number, since it is smaller than the sum of its proper divisors (1449810).

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

981918 is a wasteful number, since it uses less digits than its factorization.

981918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7808 (or 7805 counting only the distinct ones).

The product of its digits is 5184, while the sum is 36.

The square root of 981918 is about 990.9177564258. The cubic root of 981918 is about 99.3935968519.

It can be divided in two parts, 98 and 1918, that added together give a triangular number (2016 = T₆₃).

The spelling of 981918 in words is "nine hundred eighty-one thousand, nine hundred eighteen".