138427 has 2 divisors, whose sum is σ = 138428. Its totient is φ = 138426.

The previous prime is 138407. The next prime is 138433. The reversal of 138427 is 724831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138427 - 2¹¹ = 136379 is a prime.

138427 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (138407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69213 + 69214.

It is an arithmetic number, because the mean of its divisors is an integer number (69214).

2¹³⁸⁴²⁷ is an apocalyptic number.

138427 is a deficient number, since it is larger than the sum of its proper divisors (1).

138427 is an equidigital number, since it uses as much as digits as its factorization.

138427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1344, while the sum is 25.

The square root of 138427 is about 372.0577912099. The cubic root of 138427 is about 51.7297368294.

It can be divided in two parts, 138 and 427, that added together give a palindrome (565).

The spelling of 138427 in words is "one hundred thirty-eight thousand, four hundred twenty-seven".