9121640 has 32 divisors (see below), whose sum is σ = 22390560. Its totient is φ = 3316800.

The previous prime is 9121627. The next prime is 9121649. The reversal of 9121640 is 461219.

It is a happy number.

9121640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (9121649) 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, 9926 + ... + 10805.

It is an arithmetic number, because the mean of its divisors is an integer number (699705).

Almost surely, 2^9121640 is an apocalyptic number.

It is an amenable number.

9121640 is an abundant number, since it is smaller than the sum of its proper divisors (13268920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9121640 is a wasteful number, since it uses less digits than its factorization.

9121640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20753 (or 20749 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 9121640 is about 3020.2052910357. The cubic root of 9121640 is about 208.9413081229.

Adding to 9121640 its reverse (461219), we get a palindrome (9582859).

It can be divided in two parts, 912 and 1640, that added together give a palindrome (2552).

The spelling of 9121640 in words is "nine million, one hundred twenty-one thousand, six hundred forty".