168440939 has 2 divisors, whose sum is σ = 168440940. Its totient is φ = 168440938.

The previous prime is 168440917. The next prime is 168440957. The reversal of 168440939 is 939044861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 168440939 - 2⁸ = 168440683 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168440939.

It is not a weakly prime, because it can be changed into another prime (168440039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84220469 + 84220470.

It is an arithmetic number, because the mean of its divisors is an integer number (84220470).

Almost surely, 2^168440939 is an apocalyptic number.

168440939 is a deficient number, since it is larger than the sum of its proper divisors (1).

168440939 is an equidigital number, since it uses as much as digits as its factorization.

168440939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 168440939 is about 12978.4798416456. The cubic root of 168440939 is about 552.2671584950.

The spelling of 168440939 in words is "one hundred sixty-eight million, four hundred forty thousand, nine hundred thirty-nine".