138124823 has 4 divisors (see below), whose sum is σ = 138389448. Its totient is φ = 137860200.

The previous prime is 138124817. The next prime is 138124829. The reversal of 138124823 is 328421831.

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

It is an interprime number because it is at equal distance from previous prime (138124817) and next prime (138124829).

It is a cyclic number.

It is not a de Polignac number, because 138124823 - 2⁴ = 138124807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138124823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138124829) 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, 131528 + ... + 132573.

It is an arithmetic number, because the mean of its divisors is an integer number (34597362).

Almost surely, 2^138124823 is an apocalyptic number.

138124823 is a deficient number, since it is larger than the sum of its proper divisors (264625).

138124823 is an equidigital number, since it uses as much as digits as its factorization.

138124823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264624.

The product of its digits is 9216, while the sum is 32.

The square root of 138124823 is about 11752.6517433301. The cubic root of 138124823 is about 516.9206854048.

The spelling of 138124823 in words is "one hundred thirty-eight million, one hundred twenty-four thousand, eight hundred twenty-three".