9640221 has 8 divisors (see below), whose sum is σ = 12868224. Its totient is φ = 6419520.

The previous prime is 9640219. The next prime is 9640231. The reversal of 9640221 is 1220469.

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

It is not a de Polignac number, because 9640221 - 2¹ = 9640219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9640191 and 9640200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9640231) 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, 3381 + ... + 5541.

It is an arithmetic number, because the mean of its divisors is an integer number (1608528).

Almost surely, 2^9640221 is an apocalyptic number.

It is an amenable number.

9640221 is a deficient number, since it is larger than the sum of its proper divisors (3228003).

9640221 is a wasteful number, since it uses less digits than its factorization.

9640221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3651.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 9640221 is about 3104.8705287016. The cubic root of 9640221 is about 212.8281141012.

The spelling of 9640221 in words is "nine million, six hundred forty thousand, two hundred twenty-one".