18813100 has 36 divisors (see below), whose sum is σ = 41013000. Its totient is φ = 7490560.

The previous prime is 18813089. The next prime is 18813107. The reversal of 18813100 is 131881.

It is a super-2 number, since 2×18813100² = 707865463220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18813107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41676 + ... + 42124.

It is an arithmetic number, because the mean of its divisors is an integer number (1139250).

Almost surely, 2^18813100 is an apocalyptic number.

18813100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18813100 is an abundant number, since it is smaller than the sum of its proper divisors (22199900).

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

18813100 is a wasteful number, since it uses less digits than its factorization.

18813100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882 (or 875 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 18813100 is about 4337.4070595230. The cubic root of 18813100 is about 265.9623253029.

Adding to 18813100 its reverse (131881), we get a palindrome (18944981).

The spelling of 18813100 in words is "eighteen million, eight hundred thirteen thousand, one hundred".