9640921 has 8 divisors (see below), whose sum is σ = 10245960. Its totient is φ = 9040128.

The previous prime is 9640919. The next prime is 9640957. The reversal of 9640921 is 1290469.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2560000 + 7080921 = 1600^2 + 2661^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 9640921 - 2¹ = 9640919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9640991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4495 + ... + 6283.

It is an arithmetic number, because the mean of its divisors is an integer number (1280745).

Almost surely, 2^9640921 is an apocalyptic number.

It is an amenable number.

9640921 is a deficient number, since it is larger than the sum of its proper divisors (605039).

9640921 is a wasteful number, since it uses less digits than its factorization.

9640921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2123.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 9640921 is about 3104.9832527729. The cubic root of 9640921 is about 212.8332652997.

The spelling of 9640921 in words is "nine million, six hundred forty thousand, nine hundred twenty-one".