18538836 has 12 divisors (see below), whose sum is σ = 43257312. Its totient is φ = 6179608.

The previous prime is 18538811. The next prime is 18538841. The reversal of 18538836 is 63883581.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 772440 + ... + 772463.

It is an arithmetic number, because the mean of its divisors is an integer number (3604776).

Almost surely, 2^18538836 is an apocalyptic number.

It is an amenable number.

18538836 is an abundant number, since it is smaller than the sum of its proper divisors (24718476).

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

18538836 is a wasteful number, since it uses less digits than its factorization.

18538836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544910 (or 1544908 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The square root of 18538836 is about 4305.6748599958. The cubic root of 18538836 is about 264.6635626056.

The spelling of 18538836 in words is "eighteen million, five hundred thirty-eight thousand, eight hundred thirty-six".