18808871 has 4 divisors (see below), whose sum is σ = 19626672. Its totient is φ = 17991072.

The previous prime is 18808859. The next prime is 18808877. The reversal of 18808871 is 17880881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17880881 = 19 ⋅941099.

It is a cyclic number.

It is not a de Polignac number, because 18808871 - 2¹⁰ = 18807847 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 (18808877) 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, 408866 + ... + 408911.

It is an arithmetic number, because the mean of its divisors is an integer number (4906668).

Almost surely, 2^18808871 is an apocalyptic number.

18808871 is a deficient number, since it is larger than the sum of its proper divisors (817801).

18808871 is an equidigital number, since it uses as much as digits as its factorization.

18808871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817800.

The product of its (nonzero) digits is 28672, while the sum is 41.

The square root of 18808871 is about 4336.9195288822. The cubic root of 18808871 is about 265.9423952371.

The spelling of 18808871 in words is "eighteen million, eight hundred eight thousand, eight hundred seventy-one".