18703138 has 4 divisors (see below), whose sum is σ = 28054710. Its totient is φ = 9351568.

The previous prime is 18703127. The next prime is 18703141. The reversal of 18703138 is 83130781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83130781 = 241 ⋅344941.

It can be written as a sum of positive squares in only one way, i.e., 17197609 + 1505529 = 4147^2 + 1227^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4675783 + ... + 4675786.

Almost surely, 2^18703138 is an apocalyptic number.

18703138 is a deficient number, since it is larger than the sum of its proper divisors (9351572).

18703138 is an equidigital number, since it uses as much as digits as its factorization.

18703138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9351571.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18703138 is about 4324.7124759919. The cubic root of 18703138 is about 265.4431318483.

The spelling of 18703138 in words is "eighteen million, seven hundred three thousand, one hundred thirty-eight".