138378231 has 12 divisors (see below), whose sum is σ = 200829720. Its totient is φ = 91813680.

The previous prime is 138378223. The next prime is 138378259. The reversal of 138378231 is 132873831.

It is not a de Polignac number, because 138378231 - 2³ = 138378223 is a prime.

It is a super-2 number, since 2×138378231² = 38297069629378722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138378211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34536 + ... + 38333.

It is an arithmetic number, because the mean of its divisors is an integer number (16735810).

Almost surely, 2^138378231 is an apocalyptic number.

138378231 is a deficient number, since it is larger than the sum of its proper divisors (62451489).

138378231 is a wasteful number, since it uses less digits than its factorization.

138378231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73086 (or 73083 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 138378231 is about 11763.4276892409. The cubic root of 138378231 is about 517.2366117496.

The spelling of 138378231 in words is "one hundred thirty-eight million, three hundred seventy-eight thousand, two hundred thirty-one".