18493638 has 16 divisors (see below), whose sum is σ = 37059120. Its totient is φ = 6152576.

The previous prime is 18493627. The next prime is 18493649. The reversal of 18493638 is 83639481.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18493627) and next prime (18493649).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 18493638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 706 + ... + 6122.

It is an arithmetic number, because the mean of its divisors is an integer number (2316195).

Almost surely, 2^18493638 is an apocalyptic number.

18493638 is an abundant number, since it is smaller than the sum of its proper divisors (18565482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18493638 is a wasteful number, since it uses less digits than its factorization.

18493638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5991.

The product of its digits is 124416, while the sum is 42.

The square root of 18493638 is about 4300.4230024499. The cubic root of 18493638 is about 264.4483028073.

The spelling of 18493638 in words is "eighteen million, four hundred ninety-three thousand, six hundred thirty-eight".