18272873 has 2 divisors, whose sum is σ = 18272874. Its totient is φ = 18272872.

The previous prime is 18272867. The next prime is 18272939. The reversal of 18272873 is 37827281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9320809 + 8952064 = 3053^2 + 2992^2 .

It is a cyclic number.

It is not a de Polignac number, because 18272873 - 2⁶ = 18272809 is a prime.

It is not a weakly prime, because it can be changed into another prime (18272803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9136436 + 9136437.

It is an arithmetic number, because the mean of its divisors is an integer number (9136437).

Almost surely, 2^18272873 is an apocalyptic number.

It is an amenable number.

18272873 is a deficient number, since it is larger than the sum of its proper divisors (1).

18272873 is an equidigital number, since it uses as much as digits as its factorization.

18272873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37632, while the sum is 38.

The square root of 18272873 is about 4274.6781165370. The cubic root of 18272873 is about 263.3918172013.

The spelling of 18272873 in words is "eighteen million, two hundred seventy-two thousand, eight hundred seventy-three".