18038811 has 36 divisors (see below), whose sum is σ = 29070456. Its totient is φ = 9918720.

The previous prime is 18038803. The next prime is 18038821. The reversal of 18038811 is 11883081.

It is not a de Polignac number, because 18038811 - 2³ = 18038803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18038821) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 247071 + ... + 247143.

Almost surely, 2^18038811 is an apocalyptic number.

18038811 is a deficient number, since it is larger than the sum of its proper divisors (11031645).

18038811 is an equidigital number, since it uses as much as digits as its factorization.

18038811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 124 counting only the distinct ones).

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

The square root of 18038811 is about 4247.2121444543. The cubic root of 18038811 is about 262.2623627132.

The spelling of 18038811 in words is "eighteen million, thirty-eight thousand, eight hundred eleven".