9904215 has 8 divisors (see below), whose sum is σ = 15846768. Its totient is φ = 5282240.

The previous prime is 9904211. The next prime is 9904231. The reversal of 9904215 is 5124099.

It is a happy number.

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

It is not a de Polignac number, because 9904215 - 2² = 9904211 is a prime.

9904215 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9904211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330126 + ... + 330155.

It is an arithmetic number, because the mean of its divisors is an integer number (1980846).

Almost surely, 2^9904215 is an apocalyptic number.

9904215 is a deficient number, since it is larger than the sum of its proper divisors (5942553).

9904215 is a wasteful number, since it uses less digits than its factorization.

9904215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660289.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 9904215 is about 3147.0962807007. The cubic root of 9904215 is about 214.7533858810.

The spelling of 9904215 in words is "nine million, nine hundred four thousand, two hundred fifteen".