138584231 has 4 divisors (see below), whose sum is σ = 138797112. Its totient is φ = 138371352.

The previous prime is 138584219. The next prime is 138584239. The reversal of 138584231 is 132485831.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138584231 is a prime.

It is a super-2 number, since 2×138584231² = 38411178163722722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138584191 and 138584200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138584239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105461 + ... + 106766.

It is an arithmetic number, because the mean of its divisors is an integer number (34699278).

Almost surely, 2^138584231 is an apocalyptic number.

138584231 is a deficient number, since it is larger than the sum of its proper divisors (212881).

138584231 is an equidigital number, since it uses as much as digits as its factorization.

138584231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212880.

The product of its digits is 23040, while the sum is 35.

The square root of 138584231 is about 11772.1803842789. The cubic root of 138584231 is about 517.4931499634.

The spelling of 138584231 in words is "one hundred thirty-eight million, five hundred eighty-four thousand, two hundred thirty-one".