9990215 has 8 divisors (see below), whose sum is σ = 12375168. Its totient is φ = 7734240.

The previous prime is 9990209. The next prime is 9990221. The reversal of 9990215 is 5120999.

It is an interprime number because it is at equal distance from previous prime (9990209) and next prime (9990221).

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

It is not a de Polignac number, because 9990215 - 2¹⁰ = 9989191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32072 + ... + 32381.

It is an arithmetic number, because the mean of its divisors is an integer number (1546896).

Almost surely, 2^9990215 is an apocalyptic number.

9990215 is a deficient number, since it is larger than the sum of its proper divisors (2384953).

9990215 is a wasteful number, since it uses less digits than its factorization.

9990215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64489.

The product of its (nonzero) digits is 7290, while the sum is 35.

The square root of 9990215 is about 3160.7301371677. The cubic root of 9990215 is about 215.3731755927.

The spelling of 9990215 in words is "nine million, nine hundred ninety thousand, two hundred fifteen".