18809636 has 6 divisors (see below), whose sum is σ = 32916870. Its totient is φ = 9404816.

The previous prime is 18809627. The next prime is 18809657. The reversal of 18809636 is 63690881.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14212900 + 4596736 = 3770^2 + 2144^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18809593 and 18809602.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2351201 + ... + 2351208.

It is an arithmetic number, because the mean of its divisors is an integer number (5486145).

Almost surely, 2^18809636 is an apocalyptic number.

It is an amenable number.

18809636 is a deficient number, since it is larger than the sum of its proper divisors (14107234).

18809636 is a wasteful number, since it uses less digits than its factorization.

18809636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4702413 (or 4702411 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 18809636 is about 4337.0077242265. The cubic root of 18809636 is about 265.9460006843.

The spelling of 18809636 in words is "eighteen million, eight hundred nine thousand, six hundred thirty-six".