18530788 has 6 divisors (see below), whose sum is σ = 32428886. Its totient is φ = 9265392.

The previous prime is 18530767. The next prime is 18530789. The reversal of 18530788 is 88703581.

It can be written as a sum of positive squares in only one way, i.e., 10510564 + 8020224 = 3242^2 + 2832^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18530788.

It is not an unprimeable number, because it can be changed into a prime (18530789) by changing a digit.

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, 2316345 + ... + 2316352.

Almost surely, 2^18530788 is an apocalyptic number.

It is an amenable number.

18530788 is a deficient number, since it is larger than the sum of its proper divisors (13898098).

18530788 is a wasteful number, since it uses less digits than its factorization.

18530788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4632701 (or 4632699 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 18530788 is about 4304.7401779898. The cubic root of 18530788 is about 264.6252588586.

The spelling of 18530788 in words is "eighteen million, five hundred thirty thousand, seven hundred eighty-eight".