18929441 has 2 divisors, whose sum is σ = 18929442. Its totient is φ = 18929440.

The previous prime is 18929419. The next prime is 18929447. The reversal of 18929441 is 14492981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13542400 + 5387041 = 3680^2 + 2321^2 .

It is an emirp because it is prime and its reverse (14492981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18929441 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18929395 and 18929404.

It is not a weakly prime, because it can be changed into another prime (18929447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9464720 + 9464721.

It is an arithmetic number, because the mean of its divisors is an integer number (9464721).

Almost surely, 2^18929441 is an apocalyptic number.

It is an amenable number.

18929441 is a deficient number, since it is larger than the sum of its proper divisors (1).

18929441 is an equidigital number, since it uses as much as digits as its factorization.

18929441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 18929441 is about 4350.7977429432. The cubic root of 18929441 is about 266.5094397824.

The spelling of 18929441 in words is "eighteen million, nine hundred twenty-nine thousand, four hundred forty-one".