18272732 has 6 divisors (see below), whose sum is σ = 31977288. Its totient is φ = 9136364.

The previous prime is 18272731. The next prime is 18272747. The reversal of 18272732 is 23727281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18272731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2284088 + ... + 2284095.

It is an arithmetic number, because the mean of its divisors is an integer number (5329548).

Almost surely, 2^18272732 is an apocalyptic number.

It is an amenable number.

18272732 is a deficient number, since it is larger than the sum of its proper divisors (13704556).

18272732 is a wasteful number, since it uses less digits than its factorization.

18272732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4568187 (or 4568185 counting only the distinct ones).

The product of its digits is 9408, while the sum is 32.

The square root of 18272732 is about 4274.6616240353. The cubic root of 18272732 is about 263.3911397246.

The spelling of 18272732 in words is "eighteen million, two hundred seventy-two thousand, seven hundred thirty-two".