17984429987 has 4 divisors (see below), whose sum is σ = 17984743056. Its totient is φ = 17984116920.

The previous prime is 17984429971. The next prime is 17984429989. The reversal of 17984429987 is 78992448971.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 17984429987 - 2⁴ = 17984429971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17984429989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42839 + ... + 194432.

It is an arithmetic number, because the mean of its divisors is an integer number (4496185764).

Almost surely, 2^17984429987 is an apocalyptic number.

17984429987 is a deficient number, since it is larger than the sum of its proper divisors (313069).

17984429987 is an equidigital number, since it uses as much as digits as its factorization.

17984429987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313068.

The product of its digits is 73156608, while the sum is 68.

The spelling of 17984429987 in words is "seventeen billion, nine hundred eighty-four million, four hundred twenty-nine thousand, nine hundred eighty-seven".