18011536 has 15 divisors (see below), whose sum is σ = 34930273. Its totient is φ = 8997280.

The previous prime is 18011533. The next prime is 18011557. The reversal of 18011536 is 63511081.

The square root of 18011536 is 4244.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 11861136 + 6150400 = 3444^2 + 2480^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18011536.

It is not an unprimeable number, because it can be changed into a prime (18011533) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 16446 + ... + 17506.

Almost surely, 2^18011536 is an apocalyptic number.

18011536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18011536 is the 4244-th square number.

It is an amenable number.

18011536 is a deficient number, since it is larger than the sum of its proper divisors (16918737).

18011536 is an frugal number, since it uses more digits than its factorization.

18011536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130 (or 1063 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The cubic root of 18011536 is about 262.1301142660.

Multiplying 18011536 by its sum of digits (25), we get a square (450288400 = 21220²).

The spelling of 18011536 in words is "eighteen million, eleven thousand, five hundred thirty-six".