9997973 has 16 divisors (see below), whose sum is σ = 10777536. Its totient is φ = 9260160.

The previous prime is 9997969. The next prime is 9997987. The reversal of 9997973 is 3797999.

It is not a de Polignac number, because 9997973 - 2² = 9997969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997913) 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 15 ways as a sum of consecutive naturals, for example, 93386 + ... + 93492.

It is an arithmetic number, because the mean of its divisors is an integer number (673596).

Almost surely, 2^9997973 is an apocalyptic number.

It is an amenable number.

9997973 is a deficient number, since it is larger than the sum of its proper divisors (779563).

9997973 is a wasteful number, since it uses less digits than its factorization.

9997973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244.

The product of its digits is 964467, while the sum is 53.

The square root of 9997973 is about 3161.9571470847. The cubic root of 9997973 is about 215.4289112225.

The spelling of 9997973 in words is "nine million, nine hundred ninety-seven thousand, nine hundred seventy-three".