18738370234 has 4 divisors (see below), whose sum is σ = 28107555354. Its totient is φ = 9369185116.

The previous prime is 18738370229. The next prime is 18738370237. The reversal of 18738370234 is 43207383781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43207383781 = 1439 ⋅30025979.

It can be written as a sum of positive squares in only one way, i.e., 17502496209 + 1235874025 = 132297^2 + 35155^2 .

It is a super-2 number, since 2×18738370234² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18738370237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4684592557 + ... + 4684592560.

Almost surely, 2^18738370234 is an apocalyptic number.

18738370234 is a deficient number, since it is larger than the sum of its proper divisors (9369185120).

18738370234 is an equidigital number, since it uses as much as digits as its factorization.

18738370234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9369185119.

The product of its (nonzero) digits is 677376, while the sum is 46.

The spelling of 18738370234 in words is "eighteen billion, seven hundred thirty-eight million, three hundred seventy thousand, two hundred thirty-four".