7821725 has 24 divisors (see below), whose sum is σ = 10332672. Its totient is φ = 5860800.

The previous prime is 7821721. The next prime is 7821733. The reversal of 7821725 is 5271287.

It is not a de Polignac number, because 7821725 - 2² = 7821721 is a prime.

It is a super-2 number, since 2×7821725² = 122358763951250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7821691 and 7821700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7821721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34964 + ... + 35186.

It is an arithmetic number, because the mean of its divisors is an integer number (430528).

Almost surely, 2^7821725 is an apocalyptic number.

It is an amenable number.

7821725 is a deficient number, since it is larger than the sum of its proper divisors (2510947).

7821725 is a wasteful number, since it uses less digits than its factorization.

7821725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317 (or 312 counting only the distinct ones).

The product of its digits is 7840, while the sum is 32.

The square root of 7821725 is about 2796.7347031851. The cubic root of 7821725 is about 198.5032009077.

The spelling of 7821725 in words is "seven million, eight hundred twenty-one thousand, seven hundred twenty-five".