18988390996 has 24 divisors (see below), whose sum is σ = 33433595496. Its totient is φ = 9436108800.

The previous prime is 18988390961. The next prime is 18988390997. The reversal of 18988390996 is 69909388981.

It can be written as a sum of positive squares in 4 ways, for example, as 7418376900 + 11570014096 = 86130^2 + 107564^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18988390997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 422940 + ... + 465676.

It is an arithmetic number, because the mean of its divisors is an integer number (1393066479).

Almost surely, 2^18988390996 is an apocalyptic number.

It is an amenable number.

18988390996 is a deficient number, since it is larger than the sum of its proper divisors (14445204500).

18988390996 is a wasteful number, since it uses less digits than its factorization.

18988390996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43419 (or 43417 counting only the distinct ones).

The product of its (nonzero) digits is 60466176, while the sum is 70.

The spelling of 18988390996 in words is "eighteen billion, nine hundred eighty-eight million, three hundred ninety thousand, nine hundred ninety-six".