3938358857 has 2 divisors, whose sum is σ = 3938358858. Its totient is φ = 3938358856.

The previous prime is 3938358727. The next prime is 3938358859. The reversal of 3938358857 is 7588538393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2356228681 + 1582130176 = 48541^2 + 39776^2 .

It is an emirp because it is prime and its reverse (7588538393) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3938358857 - 2¹⁸ = 3938096713 is a prime.

Together with 3938358859, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 3938358796 and 3938358805.

It is not a weakly prime, because it can be changed into another prime (3938358859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1969179428 + 1969179429.

It is an arithmetic number, because the mean of its divisors is an integer number (1969179429).

Almost surely, 2^3938358857 is an apocalyptic number.

It is an amenable number.

3938358857 is a deficient number, since it is larger than the sum of its proper divisors (1).

3938358857 is an equidigital number, since it uses as much as digits as its factorization.

3938358857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21772800, while the sum is 59.

The square root of 3938358857 is about 62756.3451532990. The cubic root of 3938358857 is about 1579.2047027004.

The spelling of 3938358857 in words is "three billion, nine hundred thirty-eight million, three hundred fifty-eight thousand, eight hundred fifty-seven".