981988 has 24 divisors (see below), whose sum is σ = 2080512. Its totient is φ = 395904.

The previous prime is 981983. The next prime is 982021. The reversal of 981988 is 889189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 556 + ... + 1507.

It is an arithmetic number, because the mean of its divisors is an integer number (86688).

2⁹⁸¹⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

981988 is an abundant number, since it is smaller than the sum of its proper divisors (1098524).

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

981988 is a wasteful number, since it uses less digits than its factorization.

981988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091 (or 2089 counting only the distinct ones).

The product of its digits is 41472, while the sum is 43.

The square root of 981988 is about 990.9530765884. The cubic root of 981988 is about 99.3959586874.

The spelling of 981988 in words is "nine hundred eighty-one thousand, nine hundred eighty-eight".