39986171989 has 4 divisors (see below), whose sum is σ = 39991477824. Its totient is φ = 39980866156.

The previous prime is 39986171957. The next prime is 39986172041. The reversal of 39986171989 is 98917168993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 39986171989 - 2⁵ = 39986171957 is a prime.

It is a super-2 number, since 2×39986171989² (a number of 22 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 (39986171909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2641597 + ... + 2656690.

It is an arithmetic number, because the mean of its divisors is an integer number (9997869456).

Almost surely, 2^39986171989 is an apocalyptic number.

It is an amenable number.

39986171989 is a deficient number, since it is larger than the sum of its proper divisors (5305835).

39986171989 is an equidigital number, since it uses as much as digits as its factorization.

39986171989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5305834.

The product of its digits is 52907904, while the sum is 70.

The spelling of 39986171989 in words is "thirty-nine billion, nine hundred eighty-six million, one hundred seventy-one thousand, nine hundred eighty-nine".