39139920779 has 4 divisors (see below), whose sum is σ = 39172895784. Its totient is φ = 39106945776.

The previous prime is 39139920767. The next prime is 39139920803. The reversal of 39139920779 is 97702993193.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39139920779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39139920739) 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, 16485722 + ... + 16488095.

It is an arithmetic number, because the mean of its divisors is an integer number (9793223946).

Almost surely, 2^39139920779 is an apocalyptic number.

39139920779 is a deficient number, since it is larger than the sum of its proper divisors (32975005).

39139920779 is a wasteful number, since it uses less digits than its factorization.

39139920779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32975004.

The product of its (nonzero) digits is 5786802, while the sum is 59.

The spelling of 39139920779 in words is "thirty-nine billion, one hundred thirty-nine million, nine hundred twenty thousand, seven hundred seventy-nine".