18805971 has 4 divisors (see below), whose sum is σ = 25074632. Its totient is φ = 12537312.

The previous prime is 18805951. The next prime is 18806077. The reversal of 18805971 is 17950881.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18805971 - 2⁵ = 18805939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18805951) 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, 3134326 + ... + 3134331.

It is an arithmetic number, because the mean of its divisors is an integer number (6268658).

Almost surely, 2^18805971 is an apocalyptic number.

18805971 is a deficient number, since it is larger than the sum of its proper divisors (6268661).

18805971 is an equidigital number, since it uses as much as digits as its factorization.

18805971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6268660.

The product of its (nonzero) digits is 20160, while the sum is 39.

The square root of 18805971 is about 4336.5851773025. The cubic root of 18805971 is about 265.9287266409.

The spelling of 18805971 in words is "eighteen million, eight hundred five thousand, nine hundred seventy-one".