11871915 has 48 divisors (see below), whose sum is σ = 21654528. Its totient is φ = 5544000.

The previous prime is 11871907. The next prime is 11871929. The reversal of 11871915 is 51917811.

It is not a de Polignac number, because 11871915 - 2³ = 11871907 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

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 47 ways as a sum of consecutive naturals, for example, 56160 + ... + 56370.

It is an arithmetic number, because the mean of its divisors is an integer number (451136).

Almost surely, 2^11871915 is an apocalyptic number.

11871915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11871915 is a deficient number, since it is larger than the sum of its proper divisors (9782613).

11871915 is a wasteful number, since it uses less digits than its factorization.

11871915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272 (or 261 counting only the distinct ones).

The product of its digits is 2520, while the sum is 33.

The square root of 11871915 is about 3445.5645401008. The cubic root of 11871915 is about 228.1253734903.

The spelling of 11871915 in words is "eleven million, eight hundred seventy-one thousand, nine hundred fifteen".