39949161839 has 4 divisors (see below), whose sum is σ = 39954829824. Its totient is φ = 39943493856.

The previous prime is 39949161829. The next prime is 39949161887. The reversal of 39949161839 is 93816194993.

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 39949161839 - 2⁴ = 39949161823 is a prime.

It is a super-2 number, since 2×39949161839² (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 (39949161829) 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, 2823407 + ... + 2837520.

It is an arithmetic number, because the mean of its divisors is an integer number (9988707456).

Almost surely, 2^39949161839 is an apocalyptic number.

39949161839 is a deficient number, since it is larger than the sum of its proper divisors (5667985).

39949161839 is an equidigital number, since it uses as much as digits as its factorization.

39949161839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5667984.

The product of its digits is 11337408, while the sum is 62.

The spelling of 39949161839 in words is "thirty-nine billion, nine hundred forty-nine million, one hundred sixty-one thousand, eight hundred thirty-nine".