18743969 has 2 divisors, whose sum is σ = 18743970. Its totient is φ = 18743968.

The previous prime is 18743957. The next prime is 18743999. The reversal of 18743969 is 96934781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11641744 + 7102225 = 3412^2 + 2665^2 .

It is a cyclic number.

It is not a de Polignac number, because 18743969 - 2⁴ = 18743953 is a prime.

It is a super-2 number, since 2×18743969² = 702672747745922, which contains 22 as substring.

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 (18743909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9371984 + 9371985.

It is an arithmetic number, because the mean of its divisors is an integer number (9371985).

Almost surely, 2^18743969 is an apocalyptic number.

It is an amenable number.

18743969 is a deficient number, since it is larger than the sum of its proper divisors (1).

18743969 is an equidigital number, since it uses as much as digits as its factorization.

18743969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 47.

The square root of 18743969 is about 4329.4305630187. The cubic root of 18743969 is about 265.6361552685.

The spelling of 18743969 in words is "eighteen million, seven hundred forty-three thousand, nine hundred sixty-nine".