18690100 has 72 divisors (see below), whose sum is σ = 47684448. Its totient is φ = 6268800.

The previous prime is 18690097. The next prime is 18690107. The reversal of 18690100 is 109681.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18690107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13647 + ... + 14953.

It is an arithmetic number, because the mean of its divisors is an integer number (662284).

Almost surely, 2^18690100 is an apocalyptic number.

18690100 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 18690100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23842224).

18690100 is an abundant number, since it is smaller than the sum of its proper divisors (28994348).

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

18690100 is a wasteful number, since it uses less digits than its factorization.

18690100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345 (or 1338 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 18690100 is about 4323.2048297530. The cubic root of 18690100 is about 265.3814371735.

Adding to 18690100 its reverse (109681), we get a palindrome (18799781).

The spelling of 18690100 in words is "eighteen million, six hundred ninety thousand, one hundred".