18994600 has 48 divisors (see below), whose sum is σ = 44801820. Its totient is φ = 7488000.

The previous prime is 18994597. The next prime is 18994609. The reversal of 18994600 is 649981.

It can be written as a sum of positive squares in 6 ways, for example, as 1705636 + 17288964 = 1306^2 + 4158^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18994600.

It is not an unprimeable number, because it can be changed into a prime (18994609) 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, 13950 + ... + 15250.

Almost surely, 2^18994600 is an apocalyptic number.

18994600 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 18994600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22400910).

18994600 is an abundant number, since it is smaller than the sum of its proper divisors (25807220).

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

18994600 is a wasteful number, since it uses less digits than its factorization.

18994600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1390 (or 1381 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 18994600 is about 4358.2794770414. The cubic root of 18994600 is about 266.8148828823.

The spelling of 18994600 in words is "eighteen million, nine hundred ninety-four thousand, six hundred".