997964 has 24 divisors (see below), whose sum is σ = 1959888. Its totient is φ = 440640.

The previous prime is 997963. The next prime is 997973. The reversal of 997964 is 469799.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997961) 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, 1322 + ... + 1934.

It is an arithmetic number, because the mean of its divisors is an integer number (81662).

2⁹⁹⁷⁹⁶⁴ is an apocalyptic number.

It is an amenable number.

997964 is a deficient number, since it is larger than the sum of its proper divisors (961924).

997964 is a wasteful number, since it uses less digits than its factorization.

997964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665 (or 663 counting only the distinct ones).

The product of its digits is 122472, while the sum is 44.

The square root of 997964 is about 998.9814813098. The cubic root of 997964 is about 99.9320872223.

The spelling of 997964 in words is "nine hundred ninety-seven thousand, nine hundred sixty-four".