138868093 has 16 divisors (see below), whose sum is σ = 179912320. Its totient is φ = 104089536.

The previous prime is 138868091. The next prime is 138868097. The reversal of 138868093 is 390868831.

It is a cyclic number.

It is not a de Polignac number, because 138868093 - 2¹ = 138868091 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138868091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38430 + ... + 41887.

It is an arithmetic number, because the mean of its divisors is an integer number (11244520).

Almost surely, 2^138868093 is an apocalyptic number.

138868093 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

138868093 is a deficient number, since it is larger than the sum of its proper divisors (41044227).

138868093 is a wasteful number, since it uses less digits than its factorization.

138868093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80356.

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 138868093 is about 11784.2306919035. The cubic root of 138868093 is about 517.8462359707.

The spelling of 138868093 in words is "one hundred thirty-eight million, eight hundred sixty-eight thousand, ninety-three".