981138 has 16 divisors (see below), whose sum is σ = 2077920. Its totient is φ = 307776.

The previous prime is 981137. The next prime is 981139. The reversal of 981138 is 831189.

It is an interprime number because it is at equal distance from previous prime (981137) and next prime (981139).

It is not an unprimeable number, because it can be changed into a prime (981133) 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 7 ways as a sum of consecutive naturals, for example, 4708 + ... + 4911.

It is an arithmetic number, because the mean of its divisors is an integer number (129870).

2⁹⁸¹¹³⁸ is an apocalyptic number.

981138 is an abundant number, since it is smaller than the sum of its proper divisors (1096782).

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

981138 is a wasteful number, since it uses less digits than its factorization.

981138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9641.

The product of its digits is 1728, while the sum is 30.

The square root of 981138 is about 990.5241036946. The cubic root of 981138 is about 99.3672716588.

The spelling of 981138 in words is "nine hundred eighty-one thousand, one hundred thirty-eight".