163988 has 12 divisors (see below), whose sum is σ = 313152. Its totient is φ = 74520.

The previous prime is 163987. The next prime is 163991. The reversal of 163988 is 889361.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1820 + ... + 1907.

It is an arithmetic number, because the mean of its divisors is an integer number (26096).

2¹⁶³⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

163988 is a deficient number, since it is larger than the sum of its proper divisors (149164).

163988 is a wasteful number, since it uses less digits than its factorization.

163988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3742 (or 3740 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 163988 is about 404.9543184113. The cubic root of 163988 is about 54.7357016657.

It can be divided in two parts, 16 and 3988, that added together give a palindrome (4004).

The spelling of 163988 in words is "one hundred sixty-three thousand, nine hundred eighty-eight".