18402 has 8 divisors (see below), whose sum is σ = 36816. Its totient is φ = 6132.

The previous prime is 18401. The next prime is 18413. The reversal of 18402 is 20481.

18402 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

18402 is an admirable number.

It is a plaindrome in base 15.

It is a nialpdrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (18401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1528 + ... + 1539.

It is an arithmetic number, because the mean of its divisors is an integer number (4602).

2¹⁸⁴⁰² is an apocalyptic number.

18402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18408).

18402 is a wasteful number, since it uses less digits than its factorization.

18402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3072.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 18402 is about 135.6539715600. The cubic root of 18402 is about 26.4010789274.

Adding to 18402 its reverse (20481), we get a palindrome (38883).

The spelling of 18402 in words is "eighteen thousand, four hundred two".