18208936 has 8 divisors (see below), whose sum is σ = 34141770. Its totient is φ = 9104464.

The previous prime is 18208913. The next prime is 18208951. The reversal of 18208936 is 63980281.

It can be written as a sum of positive squares in only one way, i.e., 16048036 + 2160900 = 4006^2 + 1470^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 18208895 and 18208904.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1138051 + ... + 1138066.

Almost surely, 2^18208936 is an apocalyptic number.

It is an amenable number.

18208936 is a deficient number, since it is larger than the sum of its proper divisors (15932834).

18208936 is a wasteful number, since it uses less digits than its factorization.

18208936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2276123 (or 2276119 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 18208936 is about 4267.1929883707. The cubic root of 18208936 is about 263.0842544995.

The spelling of 18208936 in words is "eighteen million, two hundred eight thousand, nine hundred thirty-six".