11809487 has 4 divisors (see below), whose sum is σ = 11985816. Its totient is φ = 11633160.

The previous prime is 11809453. The next prime is 11809493. The reversal of 11809487 is 78490811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78490811 = 7 ⋅11212973.

It is a cyclic number.

It is not a de Polignac number, because 11809487 - 2¹⁶ = 11743951 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11809487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11809687) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 88064 + ... + 88197.

It is an arithmetic number, because the mean of its divisors is an integer number (2996454).

Almost surely, 2^11809487 is an apocalyptic number.

11809487 is a deficient number, since it is larger than the sum of its proper divisors (176329).

11809487 is an equidigital number, since it uses as much as digits as its factorization.

11809487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176328.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 11809487 is about 3436.4934162602. The cubic root of 11809487 is about 227.7248077678.

The spelling of 11809487 in words is "eleven million, eight hundred nine thousand, four hundred eighty-seven".