18279272 has 16 divisors (see below), whose sum is σ = 37389600. Its totient is φ = 8308720.

The previous prime is 18279271. The next prime is 18279277. The reversal of 18279272 is 27297281.

It is not an unprimeable number, because it can be changed into a prime (18279271) 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 in 3 ways as a sum of consecutive naturals, for example, 103772 + ... + 103947.

It is an arithmetic number, because the mean of its divisors is an integer number (2336850).

Almost surely, 2^18279272 is an apocalyptic number.

It is an amenable number.

18279272 is an abundant number, since it is smaller than the sum of its proper divisors (19110328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18279272 is a wasteful number, since it uses less digits than its factorization.

18279272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207736 (or 207732 counting only the distinct ones).

The product of its digits is 28224, while the sum is 38.

The square root of 18279272 is about 4275.4265284296. The cubic root of 18279272 is about 263.4225594485.

Subtracting 18279272 from its reverse (27297281), we obtain a square (9018009 = 3003²).

The spelling of 18279272 in words is "eighteen million, two hundred seventy-nine thousand, two hundred seventy-two".