971986 has 4 divisors (see below), whose sum is σ = 1457982. Its totient is φ = 485992.

The previous prime is 971981. The next prime is 971989. The reversal of 971986 is 689179.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 689179 = 59 ⋅11681.

It can be written as a sum of positive squares in only one way, i.e., 893025 + 78961 = 945^2 + 281^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (971981) by changing a digit.

971986 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 242995 + ... + 242998.

2⁹⁷¹⁹⁸⁶ is an apocalyptic number.

971986 is a deficient number, since it is larger than the sum of its proper divisors (485996).

971986 is a wasteful number, since it uses less digits than its factorization.

971986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485995.

The product of its digits is 27216, while the sum is 40.

The square root of 971986 is about 985.8935033765. The cubic root of 971986 is about 99.0573418783.

The spelling of 971986 in words is "nine hundred seventy-one thousand, nine hundred eighty-six".