18038771 has 4 divisors (see below), whose sum is σ = 18988200. Its totient is φ = 17089344.

The previous prime is 18038759. The next prime is 18038773. The reversal of 18038771 is 17783081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17783081 = 353 ⋅50377.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18038771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18038773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 474686 + ... + 474723.

It is an arithmetic number, because the mean of its divisors is an integer number (4747050).

Almost surely, 2^18038771 is an apocalyptic number.

18038771 is a deficient number, since it is larger than the sum of its proper divisors (949429).

18038771 is an equidigital number, since it uses as much as digits as its factorization.

18038771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949428.

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 18038771 is about 4247.2074354804. The cubic root of 18038771 is about 262.2621688627.

The spelling of 18038771 in words is "eighteen million, thirty-eight thousand, seven hundred seventy-one".