1989812064239 has 4 divisors (see below), whose sum is σ = 2000805501240. Its totient is φ = 1978818627240.

The previous prime is 1989812064221. The next prime is 1989812064311. The reversal of 1989812064239 is 9324602189891.

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 1989812064239 - 2⁸ = 1989812063983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989812054239) 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, 5496718229 + ... + 5496718590.

It is an arithmetic number, because the mean of its divisors is an integer number (500201375310).

Almost surely, 2^{1989812064239} is an apocalyptic number.

1989812064239 is a deficient number, since it is larger than the sum of its proper divisors (10993437001).

1989812064239 is a wasteful number, since it uses less digits than its factorization.

1989812064239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10993437000.

The product of its (nonzero) digits is 13436928, while the sum is 62.

The spelling of 1989812064239 in words is "one trillion, nine hundred eighty-nine billion, eight hundred twelve million, sixty-four thousand, two hundred thirty-nine".