7213440 has 192 divisors, whose sum is σ = 26303760. Its totient is φ = 1671168.

The previous prime is 7213397. The next prime is 7213441. The reversal of 7213440 is 443127.

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7213441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 424312 + ... + 424328.

Almost surely, 2^7213440 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 7213440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13151880).

7213440 is an abundant number, since it is smaller than the sum of its proper divisors (19090320).

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

7213440 is a wasteful number, since it uses less digits than its factorization.

7213440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 7213440 is about 2685.7848015059. The cubic root of 7213440 is about 193.2179520288.

Adding to 7213440 its reverse (443127), we get a palindrome (7656567).

The spelling of 7213440 in words is "seven million, two hundred thirteen thousand, four hundred forty".