163921889 has 8 divisors (see below), whose sum is σ = 167883840. Its totient is φ = 160006000.

The previous prime is 163921867. The next prime is 163921907. The reversal of 163921889 is 988129361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163921889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163921829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4259 + ... + 18600.

It is an arithmetic number, because the mean of its divisors is an integer number (20985480).

Almost surely, 2^163921889 is an apocalyptic number.

It is an amenable number.

163921889 is a deficient number, since it is larger than the sum of its proper divisors (3961951).

163921889 is a wasteful number, since it uses less digits than its factorization.

163921889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23031.

The product of its digits is 186624, while the sum is 47.

The square root of 163921889 is about 12803.1983894650. The cubic root of 163921889 is about 547.2834519584.

It can be divided in two parts, 16392 and 1889, that added together give a palindrome (18281).

The spelling of 163921889 in words is "one hundred sixty-three million, nine hundred twenty-one thousand, eight hundred eighty-nine".