3989195827985 has 4 divisors (see below), whose sum is σ = 4787034993588. Its totient is φ = 3191356662384.

The previous prime is 3989195827961. The next prime is 3989195827999. The reversal of 3989195827985 is 5897285919893.

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 2846265919744 + 1142929908241 = 1687088^2 + 1069079^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3989195827985 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398919582794 + ... + 398919582803.

It is an arithmetic number, because the mean of its divisors is an integer number (1196758748397).

Almost surely, 2^{3989195827985} is an apocalyptic number.

It is an amenable number.

3989195827985 is a deficient number, since it is larger than the sum of its proper divisors (797839165603).

3989195827985 is an equidigital number, since it uses as much as digits as its factorization.

3989195827985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797839165602.

The product of its digits is 3527193600, while the sum is 83.

The spelling of 3989195827985 in words is "three trillion, nine hundred eighty-nine billion, one hundred ninety-five million, eight hundred twenty-seven thousand, nine hundred eighty-five".