18147929 has 2 divisors, whose sum is σ = 18147930. Its totient is φ = 18147928.

The previous prime is 18147923. The next prime is 18147937. The reversal of 18147929 is 92974181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16418704 + 1729225 = 4052^2 + 1315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18147929 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18147923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9073964 + 9073965.

It is an arithmetic number, because the mean of its divisors is an integer number (9073965).

Almost surely, 2^18147929 is an apocalyptic number.

It is an amenable number.

18147929 is a deficient number, since it is larger than the sum of its proper divisors (1).

18147929 is an equidigital number, since it uses as much as digits as its factorization.

18147929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 41.

The square root of 18147929 is about 4260.0386148485. The cubic root of 18147929 is about 262.7901143201.

The spelling of 18147929 in words is "eighteen million, one hundred forty-seven thousand, nine hundred twenty-nine".