9972215 has 24 divisors (see below), whose sum is σ = 13444704. Its totient is φ = 7092800.

The previous prime is 9972199. The next prime is 9972233. The reversal of 9972215 is 5122799.

It is not a de Polignac number, because 9972215 - 2⁴ = 9972199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31910 + ... + 32220.

It is an arithmetic number, because the mean of its divisors is an integer number (560196).

Almost surely, 2^9972215 is an apocalyptic number.

9972215 is a deficient number, since it is larger than the sum of its proper divisors (3472489).

9972215 is a wasteful number, since it uses less digits than its factorization.

9972215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391 (or 380 counting only the distinct ones).

The product of its digits is 11340, while the sum is 35.

The square root of 9972215 is about 3157.8814100596. The cubic root of 9972215 is about 215.2437473537.

The spelling of 9972215 in words is "nine million, nine hundred seventy-two thousand, two hundred fifteen".