7021540 has 12 divisors (see below), whose sum is σ = 14745276. Its totient is φ = 2808608.

The previous prime is 7021519. The next prime is 7021541. The reversal of 7021540 is 451207.

It can be written as a sum of positive squares in 2 ways, for example, as 1517824 + 5503716 = 1232^2 + 2346^2 .

It is not an unprimeable number, because it can be changed into a prime (7021541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175519 + ... + 175558.

It is an arithmetic number, because the mean of its divisors is an integer number (1228773).

Almost surely, 2^7021540 is an apocalyptic number.

It is an amenable number.

7021540 is an abundant number, since it is smaller than the sum of its proper divisors (7723736).

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

7021540 is a wasteful number, since it uses less digits than its factorization.

7021540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351086 (or 351084 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 7021540 is about 2649.8188617338. The cubic root of 7021540 is about 191.4891294472.

Adding to 7021540 its reverse (451207), we get a palindrome (7472747).

The spelling of 7021540 in words is "seven million, twenty-one thousand, five hundred forty".