18489636 has 36 divisors (see below), whose sum is σ = 50987664. Its totient is φ = 5602800.

The previous prime is 18489629. The next prime is 18489637. The reversal of 18489636 is 63698481.

18489636 is a `hidden beast` number, since 1 + 8 + 4 + 8 + 9 + 636 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 18489591 and 18489600.

It is not an unprimeable number, because it can be changed into a prime (18489637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22950 + ... + 23741.

It is an arithmetic number, because the mean of its divisors is an integer number (1416324).

Almost surely, 2^18489636 is an apocalyptic number.

It is an amenable number.

18489636 is an abundant number, since it is smaller than the sum of its proper divisors (32498028).

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

18489636 is a wasteful number, since it uses less digits than its factorization.

18489636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46712 (or 46707 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 18489636 is about 4299.9576742103. The cubic root of 18489636 is about 264.4292260045.

The spelling of 18489636 in words is "eighteen million, four hundred eighty-nine thousand, six hundred thirty-six".