103815 has 16 divisors (see below), whose sum is σ = 184800. Its totient is φ = 55296.

The previous prime is 103813. The next prime is 103837. The reversal of 103815 is 518301.

It is a happy number.

It is not a de Polignac number, because 103815 - 2¹ = 103813 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 103815.

It is not an unprimeable number, because it can be changed into a prime (103811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250 + ... + 519.

It is an arithmetic number, because the mean of its divisors is an integer number (11550).

2¹⁰³⁸¹⁵ is an apocalyptic number.

103815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

103815 is a deficient number, since it is larger than the sum of its proper divisors (80985).

103815 is an equidigital number, since it uses as much as digits as its factorization.

103815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783 (or 777 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 103815 is about 322.2033519379. The cubic root of 103815 is about 46.9987927863.

The spelling of 103815 in words is "one hundred three thousand, eight hundred fifteen".