163844138 has 4 divisors (see below), whose sum is σ = 245766210. Its totient is φ = 81922068.

The previous prime is 163844137. The next prime is 163844143. The reversal of 163844138 is 831448361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831448361 = 61 ⋅13630301.

It can be written as a sum of positive squares in only one way, i.e., 132181009 + 31663129 = 11497^2 + 5627^2 .

It is not an unprimeable number, because it can be changed into a prime (163844137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40961033 + ... + 40961036.

Almost surely, 2^163844138 is an apocalyptic number.

163844138 is a deficient number, since it is larger than the sum of its proper divisors (81922072).

163844138 is an equidigital number, since it uses as much as digits as its factorization.

163844138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81922071.

The product of its digits is 55296, while the sum is 38.

The square root of 163844138 is about 12800.1616396044. The cubic root of 163844138 is about 547.1969095908.

The spelling of 163844138 in words is "one hundred sixty-three million, eight hundred forty-four thousand, one hundred thirty-eight".