18914789 has 2 divisors, whose sum is σ = 18914790. Its totient is φ = 18914788.

The previous prime is 18914759. The next prime is 18914801. The reversal of 18914789 is 98741981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15880225 + 3034564 = 3985^2 + 1742^2 .

It is a cyclic number.

It is not a de Polignac number, because 18914789 - 2¹² = 18910693 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18914719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9457394 + 9457395.

It is an arithmetic number, because the mean of its divisors is an integer number (9457395).

Almost surely, 2^18914789 is an apocalyptic number.

It is an amenable number.

18914789 is a deficient number, since it is larger than the sum of its proper divisors (1).

18914789 is an equidigital number, since it uses as much as digits as its factorization.

18914789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 47.

The square root of 18914789 is about 4349.1135878475. The cubic root of 18914789 is about 266.4406597226.

The spelling of 18914789 in words is "eighteen million, nine hundred fourteen thousand, seven hundred eighty-nine".