7122240 has 84 divisors (see below), whose sum is σ = 24507444. Its totient is φ = 1898496.

The previous prime is 7122209. The next prime is 7122253. The reversal of 7122240 is 422217.

It can be written as a sum of positive squares in 2 ways, for example, as 3968064 + 3154176 = 1992^2 + 1776^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1644 + ... + 4116.

Almost surely, 2^7122240 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 7122240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12253722).

7122240 is an abundant number, since it is smaller than the sum of its proper divisors (17385204).

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

7122240 is a wasteful number, since it uses less digits than its factorization.

7122240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2496 (or 2483 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 18.

The square root of 7122240 is about 2668.7525175632. The cubic root of 7122240 is about 192.4002068915.

Adding to 7122240 its reverse (422217), we get a palindrome (7544457).

The spelling of 7122240 in words is "seven million, one hundred twenty-two thousand, two hundred forty".