18421607 has 2 divisors, whose sum is σ = 18421608. Its totient is φ = 18421606.

The previous prime is 18421577. The next prime is 18421609. The reversal of 18421607 is 70612481.

It is a strong prime.

It is an emirp because it is prime and its reverse (70612481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18421607 - 2¹⁴ = 18405223 is a prime.

Together with 18421609, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18421607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18421609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9210803 + 9210804.

It is an arithmetic number, because the mean of its divisors is an integer number (9210804).

Almost surely, 2^18421607 is an apocalyptic number.

18421607 is a deficient number, since it is larger than the sum of its proper divisors (1).

18421607 is an equidigital number, since it uses as much as digits as its factorization.

18421607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 18421607 is about 4292.0399578755. The cubic root of 18421607 is about 264.1045222411.

The spelling of 18421607 in words is "eighteen million, four hundred twenty-one thousand, six hundred seven".