7221425 has 24 divisors (see below), whose sum is σ = 9850560. Its totient is φ = 5227200.

The previous prime is 7221391. The next prime is 7221439. The reversal of 7221425 is 5241227.

It is a happy number.

It is not a de Polignac number, because 7221425 - 2⁸ = 7221169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7221425.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 10595 + ... + 11255.

It is an arithmetic number, because the mean of its divisors is an integer number (410440).

Almost surely, 2^7221425 is an apocalyptic number.

It is an amenable number.

7221425 is a deficient number, since it is larger than the sum of its proper divisors (2629135).

7221425 is a wasteful number, since it uses less digits than its factorization.

7221425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713 (or 708 counting only the distinct ones).

The product of its digits is 1120, while the sum is 23.

The square root of 7221425 is about 2687.2709204693. The cubic root of 7221425 is about 193.2892206795.

The spelling of 7221425 in words is "seven million, two hundred twenty-one thousand, four hundred twenty-five".