18745638 has 32 divisors (see below), whose sum is σ = 39137280. Its totient is φ = 5978880.

The previous prime is 18745631. The next prime is 18745681. The reversal of 18745638 is 83654781.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 18745638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18745631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17523 + ... + 18561.

It is an arithmetic number, because the mean of its divisors is an integer number (1223040).

Almost surely, 2^18745638 is an apocalyptic number.

18745638 is an abundant number, since it is smaller than the sum of its proper divisors (20391642).

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

18745638 is a wasteful number, since it uses less digits than its factorization.

18745638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172.

The product of its digits is 161280, while the sum is 42.

The square root of 18745638 is about 4329.6233092499. The cubic root of 18745638 is about 265.6440392904.

The spelling of 18745638 in words is "eighteen million, seven hundred forty-five thousand, six hundred thirty-eight".