18229957 has 2 divisors, whose sum is σ = 18229958. Its totient is φ = 18229956.

The previous prime is 18229943. The next prime is 18229969. The reversal of 18229957 is 75992281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17859076 + 370881 = 4226^2 + 609^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18229957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18229927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9114978 + 9114979.

It is an arithmetic number, because the mean of its divisors is an integer number (9114979).

Almost surely, 2^18229957 is an apocalyptic number.

It is an amenable number.

18229957 is a deficient number, since it is larger than the sum of its proper divisors (1).

18229957 is an equidigital number, since it uses as much as digits as its factorization.

18229957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 43.

The square root of 18229957 is about 4269.6553725096. The cubic root of 18229957 is about 263.1854532985.

The spelling of 18229957 in words is "eighteen million, two hundred twenty-nine thousand, nine hundred fifty-seven".