7821285 has 16 divisors (see below), whose sum is σ = 12574656. Its totient is φ = 4151168.

The previous prime is 7821277. The next prime is 7821287. The reversal of 7821285 is 5821287.

It is a cyclic number.

It is not a de Polignac number, because 7821285 - 2³ = 7821277 is a prime.

It is a super-2 number, since 2×7821285² = 122344998102450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7821287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2257 + ... + 4553.

It is an arithmetic number, because the mean of its divisors is an integer number (785916).

Almost surely, 2^7821285 is an apocalyptic number.

It is an amenable number.

7821285 is a deficient number, since it is larger than the sum of its proper divisors (4753371).

7821285 is a wasteful number, since it uses less digits than its factorization.

7821285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2532.

The product of its digits is 8960, while the sum is 33.

The square root of 7821285 is about 2796.6560389150. The cubic root of 7821285 is about 198.4994786663.

The spelling of 7821285 in words is "seven million, eight hundred twenty-one thousand, two hundred eighty-five".