138263 has 6 divisors (see below), whose sum is σ = 146304. Its totient is φ = 130644.

The previous prime is 138251. The next prime is 138283. The reversal of 138263 is 362831.

It is not a de Polignac number, because 138263 - 2⁴ = 138247 is a prime.

It is a d-powerful number, because it can be written as 1 + 3⁴ + 2¹⁷ + 8³ + 6² + 3⁸ .

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 138263.

It is not an unprimeable number, because it can be changed into a prime (138283) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 170 + ... + 552.

It is an arithmetic number, because the mean of its divisors is an integer number (24384).

2¹³⁸²⁶³ is an apocalyptic number.

138263 is a deficient number, since it is larger than the sum of its proper divisors (8041).

138263 is an equidigital number, since it uses as much as digits as its factorization.

138263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 402 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 138263 is about 371.8373300248. The cubic root of 138263 is about 51.7092999942.

The spelling of 138263 in words is "one hundred thirty-eight thousand, two hundred sixty-three".