9121440 has 96 divisors (see below), whose sum is σ = 29707776. Its totient is φ = 2350080.

The previous prime is 9121439. The next prime is 9121493. The reversal of 9121440 is 441219.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14574 + ... + 15186.

It is an arithmetic number, because the mean of its divisors is an integer number (309456).

Almost surely, 2^9121440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9121440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14853888).

9121440 is an abundant number, since it is smaller than the sum of its proper divisors (20586336).

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

9121440 is a wasteful number, since it uses less digits than its factorization.

9121440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 9121440 is about 3020.1721805222. The cubic root of 9121440 is about 208.9397810376.

Adding to 9121440 its reverse (441219), we get a palindrome (9562659).

The spelling of 9121440 in words is "nine million, one hundred twenty-one thousand, four hundred forty".