18038002 has 4 divisors (see below), whose sum is σ = 27057006. Its totient is φ = 9019000.

The previous prime is 18037961. The next prime is 18038021. The reversal of 18038002 is 20083081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13024881 + 5013121 = 3609^2 + 2239^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 14.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4509499 + ... + 4509502.

Almost surely, 2^18038002 is an apocalyptic number.

18038002 is a deficient number, since it is larger than the sum of its proper divisors (9019004).

18038002 is an equidigital number, since it uses as much as digits as its factorization.

18038002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9019003.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 18038002 is about 4247.1169044424. The cubic root of 18038002 is about 262.2584420294.

The spelling of 18038002 in words is "eighteen million, thirty-eight thousand, two".