18738798 has 64 divisors (see below), whose sum is σ = 42696192. Its totient is φ = 5443200.

The previous prime is 18738791. The next prime is 18738799. The reversal of 18738798 is 89783781.

It is a super-2 number, since 2×18738798² = 702285100969608, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18738798.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18738791) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124023 + ... + 124173.

It is an arithmetic number, because the mean of its divisors is an integer number (667128).

Almost surely, 2^18738798 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18738798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21348096).

18738798 is an abundant number, since it is smaller than the sum of its proper divisors (23957394).

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

18738798 is a wasteful number, since it uses less digits than its factorization.

18738798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249.

The product of its digits is 677376, while the sum is 51.

The square root of 18738798 is about 4328.8333301249. The cubic root of 18738798 is about 265.6117255281.

The spelling of 18738798 in words is "eighteen million, seven hundred thirty-eight thousand, seven hundred ninety-eight".