18563812 has 6 divisors (see below), whose sum is σ = 32486678. Its totient is φ = 9281904.

The previous prime is 18563807. The next prime is 18563851. The reversal of 18563812 is 21836581.

It can be written as a sum of positive squares in only one way, i.e., 10407076 + 8156736 = 3226^2 + 2856^2 .

It is an alternating number because its digits alternate between odd and even.

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, 2320473 + ... + 2320480.

Almost surely, 2^18563812 is an apocalyptic number.

It is an amenable number.

18563812 is a deficient number, since it is larger than the sum of its proper divisors (13922866).

18563812 is a wasteful number, since it uses less digits than its factorization.

18563812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4640957 (or 4640955 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

The square root of 18563812 is about 4308.5742421363. The cubic root of 18563812 is about 264.7823631399.

The spelling of 18563812 in words is "eighteen million, five hundred sixty-three thousand, eight hundred twelve".