163840939 has 2 divisors, whose sum is σ = 163840940. Its totient is φ = 163840938.

The previous prime is 163840927. The next prime is 163840969. The reversal of 163840939 is 939048361.

It is a weak prime.

It is an emirp because it is prime and its reverse (939048361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163840939 - 2⁵ = 163840907 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 163840895 and 163840904.

It is not a weakly prime, because it can be changed into another prime (163840969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81920469 + 81920470.

It is an arithmetic number, because the mean of its divisors is an integer number (81920470).

Almost surely, 2^163840939 is an apocalyptic number.

163840939 is a deficient number, since it is larger than the sum of its proper divisors (1).

163840939 is an equidigital number, since it uses as much as digits as its factorization.

163840939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 163840939 is about 12800.0366796349. The cubic root of 163840939 is about 547.1933482909.

The spelling of 163840939 in words is "one hundred sixty-three million, eight hundred forty thousand, nine hundred thirty-nine".