9972218 has 4 divisors (see below), whose sum is σ = 14958330. Its totient is φ = 4986108.

The previous prime is 9972199. The next prime is 9972233. The reversal of 9972218 is 8122799.

9972218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 7579009 + 2393209 = 2753^2 + 1547^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2493053 + ... + 2493056.

Almost surely, 2^9972218 is an apocalyptic number.

9972218 is a deficient number, since it is larger than the sum of its proper divisors (4986112).

9972218 is a wasteful number, since it uses less digits than its factorization.

9972218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4986111.

The product of its digits is 18144, while the sum is 38.

The square root of 9972218 is about 3157.8818850616. The cubic root of 9972218 is about 215.2437689381.

The spelling of 9972218 in words is "nine million, nine hundred seventy-two thousand, two hundred eighteen".