9921885 has 8 divisors (see below), whose sum is σ = 15875040. Its totient is φ = 5291664.

The previous prime is 9921869. The next prime is 9921889. The reversal of 9921885 is 5881299.

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 9921885 - 2⁴ = 9921869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9921889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330715 + ... + 330744.

It is an arithmetic number, because the mean of its divisors is an integer number (1984380).

Almost surely, 2^9921885 is an apocalyptic number.

It is an amenable number.

9921885 is a deficient number, since it is larger than the sum of its proper divisors (5953155).

9921885 is a wasteful number, since it uses less digits than its factorization.

9921885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661467.

The product of its digits is 51840, while the sum is 42.

The square root of 9921885 is about 3149.9023794397. The cubic root of 9921885 is about 214.8810230494.

The spelling of 9921885 in words is "nine million, nine hundred twenty-one thousand, eight hundred eighty-five".