3999894646589 has 4 divisors (see below), whose sum is σ = 4075364356956. Its totient is φ = 3924424936224.

The previous prime is 3999894646567. The next prime is 3999894646609. The reversal of 3999894646589 is 9856464989993.

It is a happy number.

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 2723259052900 + 1276635593689 = 1650230^2 + 1129883^2 .

It is a cyclic number.

It is not a de Polignac number, because 3999894646589 - 2¹² = 3999894642493 is a prime.

It is a super-2 number, since 2×3999894646589² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999894640589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37734855104 + ... + 37734855209.

It is an arithmetic number, because the mean of its divisors is an integer number (1018841089239).

Almost surely, 2^{3999894646589} is an apocalyptic number.

It is an amenable number.

3999894646589 is a deficient number, since it is larger than the sum of its proper divisors (75469710367).

3999894646589 is an equidigital number, since it uses as much as digits as its factorization.

3999894646589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75469710366.

The product of its digits is 32651735040, while the sum is 89.

The spelling of 3999894646589 in words is "three trillion, nine hundred ninety-nine billion, eight hundred ninety-four million, six hundred forty-six thousand, five hundred eighty-nine".