7840285 has 8 divisors (see below), whose sum is σ = 9437400. Its totient is φ = 6252864.

The previous prime is 7840271. The next prime is 7840289. The reversal of 7840285 is 5820487.

It can be written as a sum of positive squares in 4 ways, for example, as 4084441 + 3755844 = 2021^2 + 1938^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7840285 - 2⁵ = 7840253 is a prime.

It is a super-2 number, since 2×7840285² = 122940137762450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7840285.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7840289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 502 + ... + 3991.

It is an arithmetic number, because the mean of its divisors is an integer number (1179675).

Almost surely, 2^7840285 is an apocalyptic number.

It is an amenable number.

7840285 is a deficient number, since it is larger than the sum of its proper divisors (1597115).

7840285 is a wasteful number, since it uses less digits than its factorization.

7840285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4847.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 7840285 is about 2800.0508923946. The cubic root of 7840285 is about 198.6600848507.

It can be divided in two parts, 78402 and 85, that added together give a palindrome (78487).

The spelling of 7840285 in words is "seven million, eight hundred forty thousand, two hundred eighty-five".