9972187 has 2 divisors, whose sum is σ = 9972188. Its totient is φ = 9972186.

The previous prime is 9972161. The next prime is 9972199. The reversal of 9972187 is 7812799.

It is a happy number.

9972187 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9972187 - 2⁷ = 9972059 is a prime.

9972187 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (9975187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4986093 + 4986094.

It is an arithmetic number, because the mean of its divisors is an integer number (4986094).

Almost surely, 2^9972187 is an apocalyptic number.

9972187 is a deficient number, since it is larger than the sum of its proper divisors (1).

9972187 is an equidigital number, since it uses as much as digits as its factorization.

9972187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 43.

The square root of 9972187 is about 3157.8769767044. The cubic root of 9972187 is about 215.2435458996.

It can be divided in two parts, 9 and 972187, that added together give a square (972196 = 986²).

The spelling of 9972187 in words is "nine million, nine hundred seventy-two thousand, one hundred eighty-seven".