18450638 has 4 divisors (see below), whose sum is σ = 27675960. Its totient is φ = 9225318.

The previous prime is 18450637. The next prime is 18450647. The reversal of 18450638 is 83605481.

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

It is a junction number, because it is equal to n+sod(n) for n = 18450598 and 18450607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18450631) by changing a digit.

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, 4612658 + ... + 4612661.

It is an arithmetic number, because the mean of its divisors is an integer number (6918990).

Almost surely, 2^18450638 is an apocalyptic number.

18450638 is a deficient number, since it is larger than the sum of its proper divisors (9225322).

18450638 is an equidigital number, since it uses as much as digits as its factorization.

18450638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9225321.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 18450638 is about 4295.4205847623. The cubic root of 18450638 is about 264.2431853929.

The spelling of 18450638 in words is "eighteen million, four hundred fifty thousand, six hundred thirty-eight".