7251220 has 12 divisors (see below), whose sum is σ = 15227604. Its totient is φ = 2900480.

The previous prime is 7251199. The next prime is 7251221. The reversal of 7251220 is 221527.

It can be written as a sum of positive squares in 2 ways, for example, as 2782224 + 4468996 = 1668^2 + 2114^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7251221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181261 + ... + 181300.

It is an arithmetic number, because the mean of its divisors is an integer number (1268967).

Almost surely, 2^7251220 is an apocalyptic number.

It is an amenable number.

7251220 is an abundant number, since it is smaller than the sum of its proper divisors (7976384).

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

7251220 is a wasteful number, since it uses less digits than its factorization.

7251220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362570 (or 362568 counting only the distinct ones).

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

The square root of 7251220 is about 2692.8089423500. The cubic root of 7251220 is about 193.5546876742.

Adding to 7251220 its reverse (221527), we get a palindrome (7472747).

The spelling of 7251220 in words is "seven million, two hundred fifty-one thousand, two hundred twenty".