17998963 has 2 divisors, whose sum is σ = 17998964. Its totient is φ = 17998962.

The previous prime is 17998957. The next prime is 17998973. The reversal of 17998963 is 36989971.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 17998963 - 2¹⁷ = 17867891 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 17998963.

It is not a weakly prime, because it can be changed into another prime (17998973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8999481 + 8999482.

It is an arithmetic number, because the mean of its divisors is an integer number (8999482).

Almost surely, 2^17998963 is an apocalyptic number.

17998963 is a deficient number, since it is larger than the sum of its proper divisors (1).

17998963 is an equidigital number, since it uses as much as digits as its factorization.

17998963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 52.

The square root of 17998963 is about 4242.5184737370. The cubic root of 17998963 is about 262.0691065301.

The spelling of 17998963 in words is "seventeen million, nine hundred ninety-eight thousand, nine hundred sixty-three".