18308811 has 8 divisors (see below), whose sum is σ = 24433360. Its totient is φ = 12195072.

The previous prime is 18308789. The next prime is 18308819. The reversal of 18308811 is 11880381.

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

It is not a de Polignac number, because 18308811 - 2⁷ = 18308683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18308819) 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, 2931 + ... + 6723.

It is an arithmetic number, because the mean of its divisors is an integer number (3054170).

Almost surely, 2^18308811 is an apocalyptic number.

18308811 is a deficient number, since it is larger than the sum of its proper divisors (6124549).

18308811 is a wasteful number, since it uses less digits than its factorization.

18308811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5405.

The product of its (nonzero) digits is 1536, while the sum is 30.

The square root of 18308811 is about 4278.8796430842. The cubic root of 18308811 is about 263.5643785773.

The spelling of 18308811 in words is "eighteen million, three hundred eight thousand, eight hundred eleven".