18418536 has 64 divisors (see below), whose sum is σ = 51926400. Its totient is φ = 6048000.

The previous prime is 18418487. The next prime is 18418537. The reversal of 18418536 is 63581481.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18418536.

It is not an unprimeable number, because it can be changed into a prime (18418537) 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, 14736 + ... + 15936.

It is an arithmetic number, because the mean of its divisors is an integer number (811350).

Almost surely, 2^18418536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18418536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25963200).

18418536 is an abundant number, since it is smaller than the sum of its proper divisors (33507864).

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

18418536 is a wasteful number, since it uses less digits than its factorization.

18418536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287 (or 1277 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 18418536 is about 4291.6821876742. The cubic root of 18418536 is about 264.0898454531.

The spelling of 18418536 in words is "eighteen million, four hundred eighteen thousand, five hundred thirty-six".