7213520 has 40 divisors (see below), whose sum is σ = 17231784. Its totient is φ = 2806272.

The previous prime is 7213487. The next prime is 7213541. The reversal of 7213520 is 253127.

It can be written as a sum of positive squares in 4 ways, for example, as 3857296 + 3356224 = 1964^2 + 1832^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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

It is a junction number, because it is equal to n+sod(n) for n = 7213492 and 7213501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1742 + ... + 4178.

Almost surely, 2^7213520 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 7213520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8615892).

7213520 is an abundant number, since it is smaller than the sum of its proper divisors (10018264).

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

7213520 is a wasteful number, since it uses less digits than its factorization.

7213520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2487 (or 2481 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 7213520 is about 2685.7996946906. The cubic root of 7213520 is about 193.2186663148.

Adding to 7213520 its reverse (253127), we get a palindrome (7466647).

The spelling of 7213520 in words is "seven million, two hundred thirteen thousand, five hundred twenty".