18128536 has 8 divisors (see below), whose sum is σ = 33991020. Its totient is φ = 9064264.

The previous prime is 18128533. The next prime is 18128543. The reversal of 18128536 is 63582181.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18128533) 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, 1133026 + ... + 1133041.

Almost surely, 2^18128536 is an apocalyptic number.

It is an amenable number.

18128536 is a deficient number, since it is larger than the sum of its proper divisors (15862484).

18128536 is a wasteful number, since it uses less digits than its factorization.

18128536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2266073 (or 2266069 counting only the distinct ones).

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

The square root of 18128536 is about 4257.7618533685. The cubic root of 18128536 is about 262.6964745247.

The spelling of 18128536 in words is "eighteen million, one hundred twenty-eight thousand, five hundred thirty-six".