168217389 has 24 divisors (see below), whose sum is σ = 251102592. Its totient is φ = 108457440.

The previous prime is 168217373. The next prime is 168217403. The reversal of 168217389 is 983712861.

It is not a de Polignac number, because 168217389 - 2⁴ = 168217373 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168217349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31384 + ... + 36350.

It is an arithmetic number, because the mean of its divisors is an integer number (10462608).

Almost surely, 2^168217389 is an apocalyptic number.

It is an amenable number.

168217389 is a deficient number, since it is larger than the sum of its proper divisors (82885203).

168217389 is a wasteful number, since it uses less digits than its factorization.

168217389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5097 (or 5094 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 168217389 is about 12969.8646484842. The cubic root of 168217389 is about 552.0227326019.

The spelling of 168217389 in words is "one hundred sixty-eight million, two hundred seventeen thousand, three hundred eighty-nine".