18386811 has 8 divisors (see below), whose sum is σ = 27239760. Its totient is φ = 12257856.

The previous prime is 18386807. The next prime is 18386831. The reversal of 18386811 is 11868381.

It is not a de Polignac number, because 18386811 - 2² = 18386807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18386801) 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, 340470 + ... + 340523.

It is an arithmetic number, because the mean of its divisors is an integer number (3404970).

Almost surely, 2^18386811 is an apocalyptic number.

18386811 is a deficient number, since it is larger than the sum of its proper divisors (8852949).

18386811 is an equidigital number, since it uses as much as digits as its factorization.

18386811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681002 (or 680996 counting only the distinct ones).

The product of its digits is 9216, while the sum is 36.

The square root of 18386811 is about 4287.9844915764. The cubic root of 18386811 is about 263.9381311632.

It can be divided in two parts, 1838 and 6811, that added together give a square (8649 = 93²).

The spelling of 18386811 in words is "eighteen million, three hundred eighty-six thousand, eight hundred eleven".