9421987 has 4 divisors (see below), whose sum is σ = 9515376. Its totient is φ = 9328600.

The previous prime is 9421981. The next prime is 9422027. The reversal of 9421987 is 7891249.

9421987 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9421987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9421981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46543 + ... + 46744.

It is an arithmetic number, because the mean of its divisors is an integer number (2378844).

Almost surely, 2^9421987 is an apocalyptic number.

9421987 is a deficient number, since it is larger than the sum of its proper divisors (93389).

9421987 is a wasteful number, since it uses less digits than its factorization.

9421987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93388.

The product of its digits is 36288, while the sum is 40.

The square root of 9421987 is about 3069.5255333683. The cubic root of 9421987 is about 211.2098494005.

The spelling of 9421987 in words is "nine million, four hundred twenty-one thousand, nine hundred eighty-seven".