18612811 has 8 divisors (see below), whose sum is σ = 21790944. Its totient is φ = 15564480.

The previous prime is 18612791. The next prime is 18612817. The reversal of 18612811 is 11821681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18612811 - 2¹¹ = 18610763 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18612811.

It is not an unprimeable number, because it can be changed into a prime (18612817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32140 + ... + 32713.

It is an arithmetic number, because the mean of its divisors is an integer number (2723868).

Almost surely, 2^18612811 is an apocalyptic number.

18612811 is a deficient number, since it is larger than the sum of its proper divisors (3178133).

18612811 is an equidigital number, since it uses as much as digits as its factorization.

18612811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64901.

The product of its digits is 768, while the sum is 28.

The square root of 18612811 is about 4314.2567146613. The cubic root of 18612811 is about 265.0151219566.

The spelling of 18612811 in words is "eighteen million, six hundred twelve thousand, eight hundred eleven".