18920959 has 2 divisors, whose sum is σ = 18920960. Its totient is φ = 18920958.

The previous prime is 18920939. The next prime is 18920969. The reversal of 18920959 is 95902981.

It is a strong prime.

It is an emirp because it is prime and its reverse (95902981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18920959 - 2⁷ = 18920831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18920939) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9460479 + 9460480.

It is an arithmetic number, because the mean of its divisors is an integer number (9460480).

Almost surely, 2^18920959 is an apocalyptic number.

18920959 is a deficient number, since it is larger than the sum of its proper divisors (1).

18920959 is an equidigital number, since it uses as much as digits as its factorization.

18920959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 18920959 is about 4349.8228699569. The cubic root of 18920959 is about 266.4696275346.

The spelling of 18920959 in words is "eighteen million, nine hundred twenty thousand, nine hundred fifty-nine".