39749928839 has 4 divisors (see below), whose sum is σ = 41032184640. Its totient is φ = 38467673040.

The previous prime is 39749928811. The next prime is 39749928851. The reversal of 39749928839 is 93882994793.

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 39749928839 - 2¹² = 39749924743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39749928809) 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, 641127854 + ... + 641127915.

It is an arithmetic number, because the mean of its divisors is an integer number (10258046160).

Almost surely, 2^39749928839 is an apocalyptic number.

39749928839 is a deficient number, since it is larger than the sum of its proper divisors (1282255801).

39749928839 is a wasteful number, since it uses less digits than its factorization.

39749928839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282255800.

The product of its digits is 211631616, while the sum is 71.

The spelling of 39749928839 in words is "thirty-nine billion, seven hundred forty-nine million, nine hundred twenty-eight thousand, eight hundred thirty-nine".