18061800 has 48 divisors (see below), whose sum is σ = 55993440. Its totient is φ = 4816320.

The previous prime is 18061759. The next prime is 18061819. The reversal of 18061800 is 816081.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14452 + ... + 15651.

It is an arithmetic number, because the mean of its divisors is an integer number (1166530).

Almost surely, 2^18061800 is an apocalyptic number.

18061800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18061800 is an abundant number, since it is smaller than the sum of its proper divisors (37931640).

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

18061800 is a wasteful number, since it uses less digits than its factorization.

18061800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30122 (or 30113 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 18061800 is about 4249.9176462609. The cubic root of 18061800 is about 262.3737261146.

Adding to 18061800 its reverse (816081), we get a palindrome (18877881).

The spelling of 18061800 in words is "eighteen million, sixty-one thousand, eight hundred".