18272939 has 2 divisors, whose sum is σ = 18272940. Its totient is φ = 18272938.

The previous prime is 18272873. The next prime is 18272951. The reversal of 18272939 is 93927281.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18272939 - 2²⁴ = 1495723 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18272896 and 18272905.

It is not a weakly prime, because it can be changed into another prime (18272959) 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, 9136469 + 9136470.

It is an arithmetic number, because the mean of its divisors is an integer number (9136470).

Almost surely, 2^18272939 is an apocalyptic number.

18272939 is a deficient number, since it is larger than the sum of its proper divisors (1).

18272939 is an equidigital number, since it uses as much as digits as its factorization.

18272939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 18272939 is about 4274.6858364095. The cubic root of 18272939 is about 263.3921343169.

The spelling of 18272939 in words is "eighteen million, two hundred seventy-two thousand, nine hundred thirty-nine".