163440138 has 16 divisors (see below), whose sum is σ = 331358976. Its totient is φ = 53733600.

The previous prime is 163440133. The next prime is 163440169. The reversal of 163440138 is 831044361.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (163440133) 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, 186138 + ... + 187013.

It is an arithmetic number, because the mean of its divisors is an integer number (20709936).

Almost surely, 2^163440138 is an apocalyptic number.

163440138 is an abundant number, since it is smaller than the sum of its proper divisors (167918838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

163440138 is a wasteful number, since it uses less digits than its factorization.

163440138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373229.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 163440138 is about 12784.3708488138. The cubic root of 163440138 is about 546.7467876981.

Adding to 163440138 its reverse (831044361), we get a palindrome (994484499).

The spelling of 163440138 in words is "one hundred sixty-three million, four hundred forty thousand, one hundred thirty-eight".