18047636 has 6 divisors (see below), whose sum is σ = 31583370. Its totient is φ = 9023816.

The previous prime is 18047593. The next prime is 18047647. The reversal of 18047636 is 63674081.

It can be written as a sum of positive squares in only one way, i.e., 18011536 + 36100 = 4244^2 + 190^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18047596 and 18047605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2255951 + ... + 2255958.

It is an arithmetic number, because the mean of its divisors is an integer number (5263895).

Almost surely, 2^18047636 is an apocalyptic number.

It is an amenable number.

18047636 is a deficient number, since it is larger than the sum of its proper divisors (13535734).

18047636 is a wasteful number, since it uses less digits than its factorization.

18047636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4511913 (or 4511911 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 18047636 is about 4248.2509342081. The cubic root of 18047636 is about 262.3051239947.

The spelling of 18047636 in words is "eighteen million, forty-seven thousand, six hundred thirty-six".