7725321 has 16 divisors (see below), whose sum is σ = 11491200. Its totient is φ = 5129424.

The previous prime is 7725317. The next prime is 7725323. The reversal of 7725321 is 1235277.

It is not a de Polignac number, because 7725321 - 2² = 7725317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7725323) 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 15 ways as a sum of consecutive naturals, for example, 9295 + ... + 10091.

It is an arithmetic number, because the mean of its divisors is an integer number (718200).

Almost surely, 2^7725321 is an apocalyptic number.

It is an amenable number.

7725321 is a deficient number, since it is larger than the sum of its proper divisors (3765879).

7725321 is a wasteful number, since it uses less digits than its factorization.

7725321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165 (or 1159 counting only the distinct ones).

The product of its digits is 2940, while the sum is 27.

The square root of 7725321 is about 2779.4461678543. The cubic root of 7725321 is about 197.6842994709.

The spelling of 7725321 in words is "seven million, seven hundred twenty-five thousand, three hundred twenty-one".