18816811 has 8 divisors (see below), whose sum is σ = 20608560. Its totient is φ = 17074272.

The previous prime is 18816793. The next prime is 18816823. The reversal of 18816811 is 11861881.

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 18816811 - 2¹³ = 18808619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18816851) 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, 11500 + ... + 13033.

It is an arithmetic number, because the mean of its divisors is an integer number (2576070).

Almost surely, 2^18816811 is an apocalyptic number.

18816811 is a deficient number, since it is larger than the sum of its proper divisors (1791749).

18816811 is a wasteful number, since it uses less digits than its factorization.

18816811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24605.

The product of its digits is 3072, while the sum is 34.

The square root of 18816811 is about 4337.8348285752. The cubic root of 18816811 is about 265.9798117228.

The spelling of 18816811 in words is "eighteen million, eight hundred sixteen thousand, eight hundred eleven".