18929689 has 2 divisors, whose sum is σ = 18929690. Its totient is φ = 18929688.

The previous prime is 18929683. The next prime is 18929693. The reversal of 18929689 is 98692981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18662400 + 267289 = 4320^2 + 517^2 .

It is a cyclic number.

It is not a de Polignac number, because 18929689 - 2¹¹ = 18927641 is a prime.

It is not a weakly prime, because it can be changed into another prime (18929683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9464844 + 9464845.

It is an arithmetic number, because the mean of its divisors is an integer number (9464845).

Almost surely, 2^18929689 is an apocalyptic number.

It is an amenable number.

18929689 is a deficient number, since it is larger than the sum of its proper divisors (1).

18929689 is an equidigital number, since it uses as much as digits as its factorization.

18929689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 52.

The square root of 18929689 is about 4350.8262433703. The cubic root of 18929689 is about 266.5106036493.

The spelling of 18929689 in words is "eighteen million, nine hundred twenty-nine thousand, six hundred eighty-nine".