138230293 has 4 divisors (see below), whose sum is σ = 138254688. Its totient is φ = 138205900.

The previous prime is 138230291. The next prime is 138230297. The reversal of 138230293 is 392032831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 392032831 = 1129 ⋅347239.

It is a cyclic number.

It is not a de Polignac number, because 138230293 - 2¹ = 138230291 is a prime.

It is a super-2 number, since 2×138230293² = 38215227805731698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138230291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1230 + ... + 16672.

It is an arithmetic number, because the mean of its divisors is an integer number (34563672).

Almost surely, 2^138230293 is an apocalyptic number.

It is an amenable number.

138230293 is a deficient number, since it is larger than the sum of its proper divisors (24395).

138230293 is an equidigital number, since it uses as much as digits as its factorization.

138230293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24394.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 138230293 is about 11757.1379595546. The cubic root of 138230293 is about 517.0522228374.

The spelling of 138230293 in words is "one hundred thirty-eight million, two hundred thirty thousand, two hundred ninety-three".