9487921 has 4 divisors (see below), whose sum is σ = 10046052. Its totient is φ = 8929792.

The previous prime is 9487913. The next prime is 9487939. The reversal of 9487921 is 1297849.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7485696 + 2002225 = 2736^2 + 1415^2 .

It is a cyclic number.

It is not a de Polignac number, because 9487921 - 2³ = 9487913 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9487991) 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, 279040 + ... + 279073.

It is an arithmetic number, because the mean of its divisors is an integer number (2511513).

Almost surely, 2^9487921 is an apocalyptic number.

It is an amenable number.

9487921 is a deficient number, since it is larger than the sum of its proper divisors (558131).

9487921 is a wasteful number, since it uses less digits than its factorization.

9487921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558130.

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

The square root of 9487921 is about 3080.2469056879. The cubic root of 9487921 is about 211.7013788387.

The spelling of 9487921 in words is "nine million, four hundred eighty-seven thousand, nine hundred twenty-one".