8139855 has 32 divisors (see below), whose sum is σ = 13950144. Its totient is φ = 4038656.

The previous prime is 8139829. The next prime is 8139869. The reversal of 8139855 is 5589318.

8139855 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8139855 - 2¹² = 8135759 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 34819 + ... + 35051.

It is an arithmetic number, because the mean of its divisors is an integer number (435942).

Almost surely, 2^8139855 is an apocalyptic number.

8139855 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

8139855 is a deficient number, since it is larger than the sum of its proper divisors (5810289).

8139855 is a wasteful number, since it uses less digits than its factorization.

8139855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395.

The product of its digits is 43200, while the sum is 39.

The square root of 8139855 is about 2853.0431121874. The cubic root of 8139855 is about 201.1587320684.

The spelling of 8139855 in words is "eight million, one hundred thirty-nine thousand, eight hundred fifty-five".