7021440 has 192 divisors, whose sum is σ = 25777440. Its totient is φ = 1757184.

The previous prime is 7021439. The next prime is 7021457. The reversal of 7021440 is 441207.

It is a happy number.

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

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 23 ways as a sum of consecutive naturals, for example, 132454 + ... + 132506.

Almost surely, 2^7021440 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 7021440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12888720).

7021440 is an abundant number, since it is smaller than the sum of its proper divisors (18756000).

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

7021440 is a wasteful number, since it uses less digits than its factorization.

7021440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101 (or 86 counting only the distinct ones).

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

The square root of 7021440 is about 2649.7999924523. The cubic root of 7021440 is about 191.4882203872.

Adding to 7021440 its reverse (441207), we get a palindrome (7462647).

The spelling of 7021440 in words is "seven million, twenty-one thousand, four hundred forty".