8139825 has 48 divisors (see below), whose sum is σ = 15475200. Its totient is φ = 4190400.

The previous prime is 8139797. The next prime is 8139829. The reversal of 8139825 is 5289318.

It is not a de Polignac number, because 8139825 - 2⁸ = 8139569 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8139825.

It is not an unprimeable number, because it can be changed into a prime (8139829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20731 + ... + 21119.

It is an arithmetic number, because the mean of its divisors is an integer number (322400).

Almost surely, 2^8139825 is an apocalyptic number.

It is an amenable number.

8139825 is a deficient number, since it is larger than the sum of its proper divisors (7335375).

8139825 is a wasteful number, since it uses less digits than its factorization.

8139825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 428 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 8139825 is about 2853.0378546385. The cubic root of 8139825 is about 201.1584849400.

The spelling of 8139825 in words is "eight million, one hundred thirty-nine thousand, eight hundred twenty-five".