138858165 has 16 divisors (see below), whose sum is σ = 246859200. Its totient is φ = 74057616.

The previous prime is 138858157. The next prime is 138858217. The reversal of 138858165 is 561858831.

138858165 is a `hidden beast` number, since 1 + 3 + 8 + 8 + 581 + 65 = 666.

138858165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138858165 - 2³ = 138858157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 138858165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 514155 + ... + 514424.

It is an arithmetic number, because the mean of its divisors is an integer number (15428700).

Almost surely, 2^138858165 is an apocalyptic number.

138858165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138858165 is a deficient number, since it is larger than the sum of its proper divisors (108001035).

138858165 is a wasteful number, since it uses less digits than its factorization.

138858165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028593 (or 1028587 counting only the distinct ones).

The product of its digits is 230400, while the sum is 45.

The square root of 138858165 is about 11783.8094434695. The cubic root of 138858165 is about 517.8338950030.

The spelling of 138858165 in words is "one hundred thirty-eight million, eight hundred fifty-eight thousand, one hundred sixty-five".