18716838 has 32 divisors (see below), whose sum is σ = 43330560. Its totient is φ = 5279040.

The previous prime is 18716837. The next prime is 18716849. The reversal of 18716838 is 83861781.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 18716838.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18716837) 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, 498 + ... + 6138.

It is an arithmetic number, because the mean of its divisors is an integer number (1354080).

Almost surely, 2^18716838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18716838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21665280).

18716838 is an abundant number, since it is smaller than the sum of its proper divisors (24613722).

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

18716838 is a wasteful number, since it uses less digits than its factorization.

18716838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5732.

The product of its digits is 64512, while the sum is 42.

The square root of 18716838 is about 4326.2961063709. The cubic root of 18716838 is about 265.5079281647.

The spelling of 18716838 in words is "eighteen million, seven hundred sixteen thousand, eight hundred thirty-eight".