138411823 has 4 divisors (see below), whose sum is σ = 150994728. Its totient is φ = 125828920.

The previous prime is 138411803. The next prime is 138411853. The reversal of 138411823 is 328114831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328114831 = 11 ⋅29828621.

It is a cyclic number.

It is not a de Polignac number, because 138411823 - 2²¹ = 136314671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138411803) 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, 6291436 + ... + 6291457.

It is an arithmetic number, because the mean of its divisors is an integer number (37748682).

Almost surely, 2^138411823 is an apocalyptic number.

138411823 is a deficient number, since it is larger than the sum of its proper divisors (12582905).

138411823 is a wasteful number, since it uses less digits than its factorization.

138411823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12582904.

The product of its digits is 4608, while the sum is 31.

The square root of 138411823 is about 11764.8554177261. The cubic root of 138411823 is about 517.2784622786.

The spelling of 138411823 in words is "one hundred thirty-eight million, four hundred eleven thousand, eight hundred twenty-three".