9123840 has 240 divisors, whose sum is σ = 35675640. Its totient is φ = 2211840.

The previous prime is 9123833. The next prime is 9123841. The reversal of 9123840 is 483219.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9123841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 829435 + ... + 829445.

Almost surely, 2^9123840 is an apocalyptic number.

9123840 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9123840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17837820).

9123840 is an abundant number, since it is smaller than the sum of its proper divisors (26551800).

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

9123840 is a wasteful number, since it uses less digits than its factorization.

9123840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50 (or 21 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 9123840 is about 3020.5694827300. The cubic root of 9123840 is about 208.9581045882.

The spelling of 9123840 in words is "nine million, one hundred twenty-three thousand, eight hundred forty".