7818825 has 48 divisors (see below), whose sum is σ = 15106176. Its totient is φ = 3494400.

The previous prime is 7818821. The next prime is 7818829. The reversal of 7818825 is 5288187.

It is an interprime number because it is at equal distance from previous prime (7818821) and next prime (7818829).

It is not a de Polignac number, because 7818825 - 2² = 7818821 is a prime.

It is a super-2 number, since 2×7818825² = 122268048761250, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

7818825 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7818821) 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 47 ways as a sum of consecutive naturals, for example, 27685 + ... + 27965.

It is an arithmetic number, because the mean of its divisors is an integer number (314712).

Almost surely, 2^7818825 is an apocalyptic number.

7818825 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

7818825 is a deficient number, since it is larger than the sum of its proper divisors (7287351).

7818825 is a wasteful number, since it uses less digits than its factorization.

7818825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354 (or 349 counting only the distinct ones).

The product of its digits is 35840, while the sum is 39.

The square root of 7818825 is about 2796.2161933584. The cubic root of 7818825 is about 198.4786653804.

The spelling of 7818825 in words is "seven million, eight hundred eighteen thousand, eight hundred twenty-five".