981816 has 32 divisors (see below), whose sum is σ = 2678400. Its totient is φ = 297440.

The previous prime is 981811. The next prime is 981817. The reversal of 981816 is 618189.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981811) 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, 1596 + ... + 2123.

It is an arithmetic number, because the mean of its divisors is an integer number (83700).

2⁹⁸¹⁸¹⁶ is an apocalyptic number.

It is an amenable number.

981816 is an abundant number, since it is smaller than the sum of its proper divisors (1696584).

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

981816 is a wasteful number, since it uses less digits than its factorization.

981816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3739 (or 3735 counting only the distinct ones).

The product of its digits is 3456, while the sum is 33.

The square root of 981816 is about 990.8662876493. The cubic root of 981816 is about 99.3901551191.

The spelling of 981816 in words is "nine hundred eighty-one thousand, eight hundred sixteen".