9972491 has 8 divisors (see below), whose sum is σ = 10355520. Its totient is φ = 9592128.

The previous prime is 9972451. The next prime is 9972497. The reversal of 9972491 is 1942799.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9972491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9972497) 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, 10175 + ... + 11111.

It is an arithmetic number, because the mean of its divisors is an integer number (1294440).

Almost surely, 2^9972491 is an apocalyptic number.

9972491 is a deficient number, since it is larger than the sum of its proper divisors (383029).

9972491 is a wasteful number, since it uses less digits than its factorization.

9972491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333.

The product of its digits is 40824, while the sum is 41.

The square root of 9972491 is about 3157.9251099417. The cubic root of 9972491 is about 215.2457330953.

The spelling of 9972491 in words is "nine million, nine hundred seventy-two thousand, four hundred ninety-one".