7221925 has 6 divisors (see below), whose sum is σ = 8955218. Its totient is φ = 5777520.

The previous prime is 7221917. The next prime is 7221937. The reversal of 7221925 is 5291227.

It can be written as a sum of positive squares in 3 ways, for example, as 1844164 + 5377761 = 1358^2 + 2319^2 .

It is not a de Polignac number, because 7221925 - 2³ = 7221917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7221893 and 7221902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 144414 + ... + 144463.

Almost surely, 2^7221925 is an apocalyptic number.

It is an amenable number.

7221925 is a deficient number, since it is larger than the sum of its proper divisors (1733293).

7221925 is a wasteful number, since it uses less digits than its factorization.

7221925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288887 (or 288882 counting only the distinct ones).

The product of its digits is 2520, while the sum is 28.

The square root of 7221925 is about 2687.3639500447. The cubic root of 7221925 is about 193.2936815894.

The spelling of 7221925 in words is "seven million, two hundred twenty-one thousand, nine hundred twenty-five".