18690043 has 2 divisors, whose sum is σ = 18690044. Its totient is φ = 18690042.

The previous prime is 18690041. The next prime is 18690047. The reversal of 18690043 is 34009681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18690043 - 2¹ = 18690041 is a prime.

Together with 18690041, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18689987 and 18690014.

It is not a weakly prime, because it can be changed into another prime (18690041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9345021 + 9345022.

It is an arithmetic number, because the mean of its divisors is an integer number (9345022).

Almost surely, 2^18690043 is an apocalyptic number.

18690043 is a deficient number, since it is larger than the sum of its proper divisors (1).

18690043 is an equidigital number, since it uses as much as digits as its factorization.

18690043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 18690043 is about 4323.1982374164. The cubic root of 18690043 is about 265.3811673915.

The spelling of 18690043 in words is "eighteen million, six hundred ninety thousand, forty-three".