7218425 has 12 divisors (see below), whose sum is σ = 9007980. Its totient is φ = 5737920.

The previous prime is 7218403. The next prime is 7218433. The reversal of 7218425 is 5248127.

It can be written as a sum of positive squares in 6 ways, for example, as 94864 + 7123561 = 308^2 + 2669^2 .

It is not a de Polignac number, because 7218425 - 2¹⁶ = 7152889 is a prime.

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3491 + ... + 5159.

It is an arithmetic number, because the mean of its divisors is an integer number (750665).

Almost surely, 2^7218425 is an apocalyptic number.

It is an amenable number.

7218425 is a deficient number, since it is larger than the sum of its proper divisors (1789555).

7218425 is a wasteful number, since it uses less digits than its factorization.

7218425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1852 (or 1847 counting only the distinct ones).

The product of its digits is 4480, while the sum is 29.

The square root of 7218425 is about 2686.7126753711. The cubic root of 7218425 is about 193.2624508947.

The spelling of 7218425 in words is "seven million, two hundred eighteen thousand, four hundred twenty-five".