39834956857 has 2 divisors, whose sum is σ = 39834956858. Its totient is φ = 39834956856.

The previous prime is 39834956849. The next prime is 39834956867. The reversal of 39834956857 is 75865943893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35878421056 + 3956535801 = 189416^2 + 62901^2 .

It is a cyclic number.

It is not a de Polignac number, because 39834956857 - 2³ = 39834956849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39834956792 and 39834956801.

It is not a weakly prime, because it can be changed into another prime (39834956867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19917478428 + 19917478429.

It is an arithmetic number, because the mean of its divisors is an integer number (19917478429).

Almost surely, 2^39834956857 is an apocalyptic number.

It is an amenable number.

39834956857 is a deficient number, since it is larger than the sum of its proper divisors (1).

39834956857 is an equidigital number, since it uses as much as digits as its factorization.

39834956857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 195955200, while the sum is 67.

The spelling of 39834956857 in words is "thirty-nine billion, eight hundred thirty-four million, nine hundred fifty-six thousand, eight hundred fifty-seven".