138255168 has 56 divisors (see below), whose sum is σ = 366865408. Its totient is φ = 45950976.

The previous prime is 138255127. The next prime is 138255197. The reversal of 138255168 is 861552831.

It is a super-2 number, since 2×138255168² = 38228982957416448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82305 + ... + 83967.

It is an arithmetic number, because the mean of its divisors is an integer number (6551168).

Almost surely, 2^138255168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138255168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183432704).

138255168 is an abundant number, since it is smaller than the sum of its proper divisors (228610240).

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

138255168 is a wasteful number, since it uses less digits than its factorization.

138255168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2111 (or 2101 counting only the distinct ones).

The product of its digits is 57600, while the sum is 39.

The square root of 138255168 is about 11758.1957799656. The cubic root of 138255168 is about 517.0832360650.

The spelling of 138255168 in words is "one hundred thirty-eight million, two hundred fifty-five thousand, one hundred sixty-eight".