18704929 has 2 divisors, whose sum is σ = 18704930. Its totient is φ = 18704928.

The previous prime is 18704927. The next prime is 18704989. The reversal of 18704929 is 92940781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11560000 + 7144929 = 3400^2 + 2673^2 .

It is a cyclic number.

It is not a de Polignac number, because 18704929 - 2¹ = 18704927 is a prime.

Together with 18704927, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18704891 and 18704900.

It is not a weakly prime, because it can be changed into another prime (18704921) 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, 9352464 + 9352465.

It is an arithmetic number, because the mean of its divisors is an integer number (9352465).

Almost surely, 2^18704929 is an apocalyptic number.

It is an amenable number.

18704929 is a deficient number, since it is larger than the sum of its proper divisors (1).

18704929 is an equidigital number, since it uses as much as digits as its factorization.

18704929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 18704929 is about 4324.9195368238. The cubic root of 18704929 is about 265.4516044635.

The spelling of 18704929 in words is "eighteen million, seven hundred four thousand, nine hundred twenty-nine".