7122440 has 32 divisors (see below), whose sum is σ = 17259480. Its totient is φ = 2629632.

The previous prime is 7122413. The next prime is 7122443. The reversal of 7122440 is 442217.

It can be written as a sum of positive squares in 4 ways, for example, as 2256004 + 4866436 = 1502^2 + 2206^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (7122443) 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, 6329 + ... + 7368.

Almost surely, 2^7122440 is an apocalyptic number.

It is an amenable number.

7122440 is an abundant number, since it is smaller than the sum of its proper divisors (10137040).

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

7122440 is a wasteful number, since it uses less digits than its factorization.

7122440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13721 (or 13717 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 7122440 is about 2668.7899879908. The cubic root of 7122440 is about 192.4020078081.

Adding to 7122440 its reverse (442217), we get a palindrome (7564657).

The spelling of 7122440 in words is "seven million, one hundred twenty-two thousand, four hundred forty".