981986 has 4 divisors (see below), whose sum is σ = 1472982. Its totient is φ = 490992.

The previous prime is 981983. The next prime is 982021. The reversal of 981986 is 689189.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 689189 = 617 ⋅1117.

It can be written as a sum of positive squares in only one way, i.e., 591361 + 390625 = 769^2 + 625^2 .

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 as a sum of consecutive naturals, namely, 245495 + ... + 245498.

2⁹⁸¹⁹⁸⁶ is an apocalyptic number.

981986 is a deficient number, since it is larger than the sum of its proper divisors (490996).

981986 is a wasteful number, since it uses less digits than its factorization.

981986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490995.

The product of its digits is 31104, while the sum is 41.

The square root of 981986 is about 990.9520674584. The cubic root of 981986 is about 99.3958912079.

The spelling of 981986 in words is "nine hundred eighty-one thousand, nine hundred eighty-six".