18489347 has 2 divisors, whose sum is σ = 18489348. Its totient is φ = 18489346.

The previous prime is 18489311. The next prime is 18489349. The reversal of 18489347 is 74398481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18489347 - 2¹² = 18485251 is a prime.

Together with 18489349, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18489298 and 18489307.

It is not a weakly prime, because it can be changed into another prime (18489349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9244673 + 9244674.

It is an arithmetic number, because the mean of its divisors is an integer number (9244674).

Almost surely, 2^18489347 is an apocalyptic number.

18489347 is a deficient number, since it is larger than the sum of its proper divisors (1).

18489347 is an equidigital number, since it uses as much as digits as its factorization.

18489347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 44.

The square root of 18489347 is about 4299.9240690970. The cubic root of 18489347 is about 264.4278482877.

The spelling of 18489347 in words is "eighteen million, four hundred eighty-nine thousand, three hundred forty-seven".