9140721 has 8 divisors (see below), whose sum is σ = 12230400. Its totient is φ = 6072432.

The previous prime is 9140717. The next prime is 9140749. The reversal of 9140721 is 1270419.

9140721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 9140721 - 2² = 9140717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9140691 and 9140700.

It is not an unprimeable number, because it can be changed into a prime (9140711) 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, 4321 + ... + 6078.

It is an arithmetic number, because the mean of its divisors is an integer number (1528800).

Almost surely, 2^9140721 is an apocalyptic number.

It is an amenable number.

9140721 is a deficient number, since it is larger than the sum of its proper divisors (3089679).

9140721 is a wasteful number, since it uses less digits than its factorization.

9140721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10695.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 9140721 is about 3023.3625320163. The cubic root of 9140721 is about 209.0868971620.

The spelling of 9140721 in words is "nine million, one hundred forty thousand, seven hundred twenty-one".