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115815 = 3571103
BaseRepresentation
bin11100010001100111
312212212110
4130101213
512201230
62252103
7661440
oct342147
9185773
10115815
117a017
1257033
134093b
14302c7
15244b0
hex1c467

115815 has 16 divisors (see below), whose sum is σ = 211968. Its totient is φ = 52896.

The previous prime is 115811. The next prime is 115823. The reversal of 115815 is 518511.

It is not a de Polignac number, because 115815 - 22 = 115811 is a prime.

It is a super-2 number, since 2×1158152 = 26826228450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

115815 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 115791 and 115800.

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 115815.

It is not an unprimeable number, because it can be changed into a prime (115811) 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, 447 + ... + 656.

It is an arithmetic number, because the mean of its divisors is an integer number (13248).

2115815 is an apocalyptic number.

115815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

115815 is a deficient number, since it is larger than the sum of its proper divisors (96153).

115815 is a wasteful number, since it uses less digits than its factorization.

115815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118.

The product of its digits is 200, while the sum is 21.

The square root of 115815 is about 340.3160295960. The cubic root of 115815 is about 48.7440492408.

Multiplying 115815 by its sum of digits (21), we get a triangular number (2432115 = T2205).

The spelling of 115815 in words is "one hundred fifteen thousand, eight hundred fifteen".

Divisors: 1 3 5 7 15 21 35 105 1103 3309 5515 7721 16545 23163 38605 115815