17987399812 has 6 divisors (see below), whose sum is σ = 31477949678. Its totient is φ = 8993699904.

The previous prime is 17987399791. The next prime is 17987399813. The reversal of 17987399812 is 21899378971.

It can be written as a sum of positive squares in only one way, i.e., 10232131716 + 7755268096 = 101154^2 + 88064^2 .

It is not an unprimeable number, because it can be changed into a prime (17987399813) 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, 2248424973 + ... + 2248424980.

Almost surely, 2^17987399812 is an apocalyptic number.

It is an amenable number.

17987399812 is a deficient number, since it is larger than the sum of its proper divisors (13490549866).

17987399812 is a wasteful number, since it uses less digits than its factorization.

17987399812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4496849957 (or 4496849955 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 64.

The spelling of 17987399812 in words is "seventeen billion, nine hundred eighty-seven million, three hundred ninety-nine thousand, eight hundred twelve".