7813825 has 6 divisors (see below), whose sum is σ = 9689174. Its totient is φ = 6251040.

The previous prime is 7813823. The next prime is 7813849. The reversal of 7813825 is 5283187.

It can be written as a sum of positive squares in 3 ways, for example, as 2187441 + 5626384 = 1479^2 + 2372^2 .

It is not a de Polignac number, because 7813825 - 2¹ = 7813823 is a prime.

It is a super-2 number, since 2×7813825² = 122111722261250, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7813823) 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 5 ways as a sum of consecutive naturals, for example, 156252 + ... + 156301.

Almost surely, 2^7813825 is an apocalyptic number.

It is an amenable number.

7813825 is a deficient number, since it is larger than the sum of its proper divisors (1875349).

7813825 is a wasteful number, since it uses less digits than its factorization.

7813825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312563 (or 312558 counting only the distinct ones).

The product of its digits is 13440, while the sum is 34.

The square root of 7813825 is about 2795.3219850314. The cubic root of 7813825 is about 198.4363484960.

The spelling of 7813825 in words is "seven million, eight hundred thirteen thousand, eight hundred twenty-five".