138368243 has 12 divisors (see below), whose sum is σ = 151304400. Its totient is φ = 126468576.

The previous prime is 138368239. The next prime is 138368249. The reversal of 138368243 is 342863831.

It is not a de Polignac number, because 138368243 - 2² = 138368239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138368197 and 138368206.

It is not an unprimeable number, because it can be changed into a prime (138368249) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13433 + ... + 21381.

It is an arithmetic number, because the mean of its divisors is an integer number (12608700).

Almost surely, 2^138368243 is an apocalyptic number.

138368243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

138368243 is a deficient number, since it is larger than the sum of its proper divisors (12936157).

138368243 is a wasteful number, since it uses less digits than its factorization.

138368243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8078 (or 8065 counting only the distinct ones).

The product of its digits is 82944, while the sum is 38.

The square root of 138368243 is about 11763.0031454557. The cubic root of 138368243 is about 517.2241669126.

The spelling of 138368243 in words is "one hundred thirty-eight million, three hundred sixty-eight thousand, two hundred forty-three".