997982 has 8 divisors (see below), whose sum is σ = 1504200. Its totient is φ = 496584.

The previous prime is 997973. The next prime is 997991. The reversal of 997982 is 289799.

It is an interprime number because it is at equal distance from previous prime (997973) and next prime (997991).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

997982 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 632 + ... + 1547.

It is an arithmetic number, because the mean of its divisors is an integer number (188025).

2⁹⁹⁷⁹⁸² is an apocalyptic number.

997982 is a deficient number, since it is larger than the sum of its proper divisors (506218).

997982 is a wasteful number, since it uses less digits than its factorization.

997982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2410.

The product of its digits is 81648, while the sum is 44.

The square root of 997982 is about 998.9904904452. The cubic root of 997982 is about 99.9326880345.

The spelling of 997982 in words is "nine hundred ninety-seven thousand, nine hundred eighty-two".