18689650 has 48 divisors (see below), whose sum is σ = 40372416. Its totient is φ = 6304320.

The previous prime is 18689641. The next prime is 18689653. The reversal of 18689650 is 5698681.

It is a junction number, because it is equal to n+sod(n) for n = 18689597 and 18689606.

It is not an unprimeable number, because it can be changed into a prime (18689653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23052 + ... + 23848.

It is an arithmetic number, because the mean of its divisors is an integer number (841092).

Almost surely, 2^18689650 is an apocalyptic number.

18689650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18689650 is an abundant number, since it is smaller than the sum of its proper divisors (21682766).

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

18689650 is a wasteful number, since it uses less digits than its factorization.

18689650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883 (or 878 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The square root of 18689650 is about 4323.1527847163. The cubic root of 18689650 is about 265.3793073007.

The spelling of 18689650 in words is "eighteen million, six hundred eighty-nine thousand, six hundred fifty".