389143713218 has 18 divisors (see below), whose sum is σ = 632089334457. Its totient is φ = 179599497480.

The previous prime is 389143713193. The next prime is 389143713227. The reversal of 389143713218 is 812317341983.

It can be written as a sum of positive squares in 2 ways, for example, as 332729387929 + 56414325289 = 576827^2 + 237517^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=441103.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 11451713 + ... + 11485643.

Almost surely, 2^389143713218 is an apocalyptic number.

389143713218 is a deficient number, since it is larger than the sum of its proper divisors (242945621239).

389143713218 is an frugal number, since it uses more digits than its factorization.

389143713218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67890 (or 33946 counting only the distinct ones).

The product of its digits is 870912, while the sum is 50.

Multiplying 389143713218 by its sum of digits (50), we get a square (19457185660900 = 4411030²).

The spelling of 389143713218 in words is "three hundred eighty-nine billion, one hundred forty-three million, seven hundred thirteen thousand, two hundred eighteen".