138576823 has 48 divisors (see below), whose sum is σ = 187264000. Its totient is φ = 100077120.

The previous prime is 138576787. The next prime is 138576833. The reversal of 138576823 is 328675831.

It is not a de Polignac number, because 138576823 - 2²¹ = 136479671 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138576823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138576833) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1271293 + ... + 1271401.

Almost surely, 2^138576823 is an apocalyptic number.

138576823 is a deficient number, since it is larger than the sum of its proper divisors (48687177).

138576823 is a wasteful number, since it uses less digits than its factorization.

138576823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 225 counting only the distinct ones).

The product of its digits is 241920, while the sum is 43.

The square root of 138576823 is about 11771.8657399751. The cubic root of 138576823 is about 517.4839289586.

The spelling of 138576823 in words is "one hundred thirty-eight million, five hundred seventy-six thousand, eight hundred twenty-three".