9971997 has 8 divisors (see below), whose sum is σ = 15195456. Its totient is φ = 5698272.

The previous prime is 9971993. The next prime is 9972007. The reversal of 9971997 is 7991799.

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

It is not a de Polignac number, because 9971997 - 2² = 9971993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9971993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237408 + ... + 237449.

It is an arithmetic number, because the mean of its divisors is an integer number (1899432).

Almost surely, 2^9971997 is an apocalyptic number.

It is an amenable number.

9971997 is a deficient number, since it is larger than the sum of its proper divisors (5223459).

9971997 is a wasteful number, since it uses less digits than its factorization.

9971997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474867.

The product of its digits is 321489, while the sum is 51.

The square root of 9971997 is about 3157.8468930586. The cubic root of 9971997 is about 215.2421788798.

The spelling of 9971997 in words is "nine million, nine hundred seventy-one thousand, nine hundred ninety-seven".