163407989 has 4 divisors (see below), whose sum is σ = 164410656. Its totient is φ = 162405324.

The previous prime is 163407967. The next prime is 163408013. The reversal of 163407989 is 989704361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 989704361 = 2309 ⋅428629.

It is a cyclic number.

It is not a de Polignac number, because 163407989 - 2²⁰ = 162359413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163407929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 501089 + ... + 501414.

It is an arithmetic number, because the mean of its divisors is an integer number (41102664).

Almost surely, 2^163407989 is an apocalyptic number.

It is an amenable number.

163407989 is a deficient number, since it is larger than the sum of its proper divisors (1002667).

163407989 is a wasteful number, since it uses less digits than its factorization.

163407989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002666.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 163407989 is about 12783.1134313985. The cubic root of 163407989 is about 546.7109366207.

The spelling of 163407989 in words is "one hundred sixty-three million, four hundred seven thousand, nine hundred eighty-nine".