168440039 has 2 divisors, whose sum is σ = 168440040. Its totient is φ = 168440038.

The previous prime is 168439991. The next prime is 168440059. The reversal of 168440039 is 930044861.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168440039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 168439990 and 168440008.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168440059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84220019 + 84220020.

It is an arithmetic number, because the mean of its divisors is an integer number (84220020).

Almost surely, 2^168440039 is an apocalyptic number.

168440039 is a deficient number, since it is larger than the sum of its proper divisors (1).

168440039 is an equidigital number, since it uses as much as digits as its factorization.

168440039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 168440039 is about 12978.4451688174. The cubic root of 168440039 is about 552.2661748835.

The spelling of 168440039 in words is "one hundred sixty-eight million, four hundred forty thousand, thirty-nine".