18323738 has 4 divisors (see below), whose sum is σ = 27485610. Its totient is φ = 9161868.

The previous prime is 18323731. The next prime is 18323777. The reversal of 18323738 is 83732381.

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., 11785489 + 6538249 = 3433^2 + 2557^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18323698 and 18323707.

It is not an unprimeable number, because it can be changed into a prime (18323731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4580933 + ... + 4580936.

Almost surely, 2^18323738 is an apocalyptic number.

18323738 is a deficient number, since it is larger than the sum of its proper divisors (9161872).

18323738 is an equidigital number, since it uses as much as digits as its factorization.

18323738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9161871.

The product of its digits is 24192, while the sum is 35.

The square root of 18323738 is about 4280.6235527082. The cubic root of 18323738 is about 263.6359863000.

It can be divided in two parts, 1832373 and 8, that added together give a palindrome (1832381).

The spelling of 18323738 in words is "eighteen million, three hundred twenty-three thousand, seven hundred thirty-eight".