39939123847 has 4 divisors (see below), whose sum is σ = 45644712976. Its totient is φ = 34233534720.

The previous prime is 39939123767. The next prime is 39939123923. The reversal of 39939123847 is 74832193993.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74832193993 = 107 ⋅699366299.

It is not a de Polignac number, because 39939123847 - 2³¹ = 37791640199 is a prime.

It is a super-2 number, since 2×39939123847² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39939123791 and 39939123800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39939126847) 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, 2852794554 + ... + 2852794567.

It is an arithmetic number, because the mean of its divisors is an integer number (11411178244).

Almost surely, 2^39939123847 is an apocalyptic number.

39939123847 is a deficient number, since it is larger than the sum of its proper divisors (5705589129).

39939123847 is an equidigital number, since it uses as much as digits as its factorization.

39939123847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5705589128.

The product of its digits is 8817984, while the sum is 58.

The spelling of 39939123847 in words is "thirty-nine billion, nine hundred thirty-nine million, one hundred twenty-three thousand, eight hundred forty-seven".