997976 has 32 divisors (see below), whose sum is σ = 2177280. Its totient is φ = 420000.

The previous prime is 997973. The next prime is 997991. The reversal of 997976 is 679799.

It is a self number, because there is not a number n which added to its sum of digits gives 997976.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997973) 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, 3851 + ... + 4101.

It is an arithmetic number, because the mean of its divisors is an integer number (68040).

2⁹⁹⁷⁹⁷⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1088640).

997976 is an abundant number, since it is smaller than the sum of its proper divisors (1179304).

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

997976 is a wasteful number, since it uses less digits than its factorization.

997976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335 (or 331 counting only the distinct ones).

The product of its digits is 214326, while the sum is 47.

The square root of 997976 is about 998.9874874091. The cubic root of 997976 is about 99.9324877646.

The spelling of 997976 in words is "nine hundred ninety-seven thousand, nine hundred seventy-six".