18888959 has 2 divisors, whose sum is σ = 18888960. Its totient is φ = 18888958.

The previous prime is 18888949. The next prime is 18888973. The reversal of 18888959 is 95988881.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18888959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18888949) 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, 9444479 + 9444480.

It is an arithmetic number, because the mean of its divisors is an integer number (9444480).

Almost surely, 2^18888959 is an apocalyptic number.

18888959 is a deficient number, since it is larger than the sum of its proper divisors (1).

18888959 is an equidigital number, since it uses as much as digits as its factorization.

18888959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1658880, while the sum is 56.

The square root of 18888959 is about 4346.1430027094. The cubic root of 18888959 is about 266.3193208525.

The spelling of 18888959 in words is "eighteen million, eight hundred eighty-eight thousand, nine hundred fifty-nine".