17987046409 has 4 divisors (see below), whose sum is σ = 18425754900. Its totient is φ = 17548337920.

The previous prime is 17987046403. The next prime is 17987046419. The reversal of 17987046409 is 90464078971.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4560030784 + 13427015625 = 67528^2 + 115875^2 .

It is a cyclic number.

It is not a de Polignac number, because 17987046409 - 2⁵ = 17987046377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 17987046409.

It is not an unprimeable number, because it can be changed into a prime (17987046403) 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 in 3 ways as a sum of consecutive naturals, for example, 219354184 + ... + 219354265.

It is an arithmetic number, because the mean of its divisors is an integer number (4606438725).

Almost surely, 2^17987046409 is an apocalyptic number.

It is an amenable number.

17987046409 is a deficient number, since it is larger than the sum of its proper divisors (438708491).

17987046409 is an equidigital number, since it uses as much as digits as its factorization.

17987046409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438708490.

The product of its (nonzero) digits is 3048192, while the sum is 55.

The spelling of 17987046409 in words is "seventeen billion, nine hundred eighty-seven million, forty-six thousand, four hundred nine".