39878139079 has 4 divisors (see below), whose sum is σ = 42223911984. Its totient is φ = 37532366176.

The previous prime is 39878139071. The next prime is 39878139121. The reversal of 39878139079 is 97093187893.

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 39878139079 - 2³ = 39878139071 is a prime.

It is a super-3 number, since 3×39878139079³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 39878139079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39878139071) 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, 1172886427 + ... + 1172886460.

It is an arithmetic number, because the mean of its divisors is an integer number (10555977996).

Almost surely, 2^39878139079 is an apocalyptic number.

39878139079 is a deficient number, since it is larger than the sum of its proper divisors (2345772905).

39878139079 is a wasteful number, since it uses less digits than its factorization.

39878139079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345772904.

The product of its (nonzero) digits is 20575296, while the sum is 64.

The spelling of 39878139079 in words is "thirty-nine billion, eight hundred seventy-eight million, one hundred thirty-nine thousand, seventy-nine".