18490100 has 18 divisors (see below), whose sum is σ = 40123734. Its totient is φ = 7396000.

The previous prime is 18490099. The next prime is 18490103. The reversal of 18490100 is 109481.

It can be written as a sum of positive squares in 3 ways, for example, as 6615184 + 11874916 = 2572^2 + 3446^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18490103) 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 5 ways as a sum of consecutive naturals, for example, 92351 + ... + 92550.

Almost surely, 2^18490100 is an apocalyptic number.

18490100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18490100 is an abundant number, since it is smaller than the sum of its proper divisors (21633634).

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

18490100 is a wasteful number, since it uses less digits than its factorization.

18490100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184915 (or 184908 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 18490100 is about 4300.0116278913. The cubic root of 18490100 is about 264.4314379488.

Adding to 18490100 its reverse (109481), we get a palindrome (18599581).

The spelling of 18490100 in words is "eighteen million, four hundred ninety thousand, one hundred".