7542240 has 96 divisors (see below), whose sum is σ = 25038720. Its totient is φ = 1903104.

The previous prime is 7542187. The next prime is 7542253. The reversal of 7542240 is 422457.

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

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 7542240.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 8707 + ... + 9533.

It is an arithmetic number, because the mean of its divisors is an integer number (260820).

Almost surely, 2^7542240 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 7542240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12519360).

7542240 is an abundant number, since it is smaller than the sum of its proper divisors (17496480).

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

7542240 is a wasteful number, since it uses less digits than its factorization.

7542240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864 (or 856 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 7542240 is about 2746.3138932030. The cubic root of 7542240 is about 196.1101699107.

Adding to 7542240 its reverse (422457), we get a palindrome (7964697).

The spelling of 7542240 in words is "seven million, five hundred forty-two thousand, two hundred forty".