18634318 has 4 divisors (see below), whose sum is σ = 27951480. Its totient is φ = 9317158.

The previous prime is 18634309. The next prime is 18634331. The reversal of 18634318 is 81343681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81343681 = 73 ⋅1114297.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4658578 + ... + 4658581.

It is an arithmetic number, because the mean of its divisors is an integer number (6987870).

Almost surely, 2^18634318 is an apocalyptic number.

18634318 is a deficient number, since it is larger than the sum of its proper divisors (9317162).

18634318 is an equidigital number, since it uses as much as digits as its factorization.

18634318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9317161.

The product of its digits is 13824, while the sum is 34.

The square root of 18634318 is about 4316.7485449120. The cubic root of 18634318 is about 265.1171571681.

Adding to 18634318 its reverse (81343681), we get a palindrome (99977999).

The spelling of 18634318 in words is "eighteen million, six hundred thirty-four thousand, three hundred eighteen".