18143929 has 2 divisors, whose sum is σ = 18143930. Its totient is φ = 18143928.

The previous prime is 18143921. The next prime is 18143969. The reversal of 18143929 is 92934181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18020025 + 123904 = 4245^2 + 352^2 .

It is a cyclic number.

It is not a de Polignac number, because 18143929 - 2³ = 18143921 is a prime.

It is not a weakly prime, because it can be changed into another prime (18143921) 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, 9071964 + 9071965.

It is an arithmetic number, because the mean of its divisors is an integer number (9071965).

Almost surely, 2^18143929 is an apocalyptic number.

It is an amenable number.

18143929 is a deficient number, since it is larger than the sum of its proper divisors (1).

18143929 is an equidigital number, since it uses as much as digits as its factorization.

18143929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 37.

The square root of 18143929 is about 4259.5691096636. The cubic root of 18143929 is about 262.7708056395.

The spelling of 18143929 in words is "eighteen million, one hundred forty-three thousand, nine hundred twenty-nine".