18271672 has 16 divisors (see below), whose sum is σ = 34396560. Its totient is φ = 9099264.

The previous prime is 18271667. The next prime is 18271699. The reversal of 18271672 is 27617281.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 2388 + ... + 6499.

It is an arithmetic number, because the mean of its divisors is an integer number (2149785).

Almost surely, 2^18271672 is an apocalyptic number.

It is an amenable number.

18271672 is a deficient number, since it is larger than the sum of its proper divisors (16124888).

18271672 is a wasteful number, since it uses less digits than its factorization.

18271672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9150 (or 9146 counting only the distinct ones).

The product of its digits is 9408, while the sum is 34.

The square root of 18271672 is about 4274.5376358151. The cubic root of 18271672 is about 263.3860465251.

The spelling of 18271672 in words is "eighteen million, two hundred seventy-one thousand, six hundred seventy-two".