11816887 has 4 divisors (see below), whose sum is σ = 12512016. Its totient is φ = 11121760.

The previous prime is 11816869. The next prime is 11816911. The reversal of 11816887 is 78861811.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78861811 = 7 ⋅11265973.

It is a cyclic number.

It is not a de Polignac number, because 11816887 - 2¹⁹ = 11292599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11816837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347539 + ... + 347572.

It is an arithmetic number, because the mean of its divisors is an integer number (3128004).

Almost surely, 2^11816887 is an apocalyptic number.

11816887 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

11816887 is a deficient number, since it is larger than the sum of its proper divisors (695129).

11816887 is an equidigital number, since it uses as much as digits as its factorization.

11816887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695128.

The product of its digits is 21504, while the sum is 40.

The square root of 11816887 is about 3437.5699265615. The cubic root of 11816887 is about 227.7723630854.

The spelling of 11816887 in words is "eleven million, eight hundred sixteen thousand, eight hundred eighty-seven".