18402000 has 80 divisors (see below), whose sum is σ = 59347392. Its totient is φ = 4905600.

The previous prime is 18401983. The next prime is 18402011. The reversal of 18402000 is 20481.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4467 + ... + 7533.

Almost surely, 2^18402000 is an apocalyptic number.

18402000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18402000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29673696).

18402000 is an abundant number, since it is smaller than the sum of its proper divisors (40945392).

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

18402000 is a wasteful number, since it uses less digits than its factorization.

18402000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3093 (or 3077 counting only the distinct ones).

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

The square root of 18402000 is about 4289.7552377729. The cubic root of 18402000 is about 264.0107892744.

Adding to 18402000 its reverse (20481), we get a palindrome (18422481).

The spelling of 18402000 in words is "eighteen million, four hundred two thousand".