981090 has 48 divisors (see below), whose sum is σ = 2785536. Its totient is φ = 237600.

The previous prime is 981077. The next prime is 981091. The reversal of 981090 is 90189.

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 981090.

It is not an unprimeable number, because it can be changed into a prime (981091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 495 + ... + 1485.

It is an arithmetic number, because the mean of its divisors is an integer number (58032).

2⁹⁸¹⁰⁹⁰ is an apocalyptic number.

981090 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a pronic number, being equal to 990×991.

It is a practical number, because each smaller number is the sum of distinct divisors of 981090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1392768).

981090 is an abundant number, since it is smaller than the sum of its proper divisors (1804446).

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

981090 is a wasteful number, since it uses less digits than its factorization.

981090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015 (or 1012 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 981090 is about 990.4998738011. The cubic root of 981090 is about 99.3656511913.

The spelling of 981090 in words is "nine hundred eighty-one thousand, ninety".