18948959 has 2 divisors, whose sum is σ = 18948960. Its totient is φ = 18948958.

The previous prime is 18948953. The next prime is 18948973. The reversal of 18948959 is 95984981.

It is a weak prime.

It is an emirp because it is prime and its reverse (95984981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18948959 is a prime.

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 18948959.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18948953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9474479 + 9474480.

It is an arithmetic number, because the mean of its divisors is an integer number (9474480).

Almost surely, 2^18948959 is an apocalyptic number.

18948959 is a deficient number, since it is larger than the sum of its proper divisors (1).

18948959 is an equidigital number, since it uses as much as digits as its factorization.

18948959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 53.

The square root of 18948959 is about 4353.0402019738. The cubic root of 18948959 is about 266.6010069246.

The spelling of 18948959 in words is "eighteen million, nine hundred forty-eight thousand, nine hundred fifty-nine".