138316225 has 24 divisors (see below), whose sum is σ = 179184960. Its totient is φ = 105779520.

The previous prime is 138316223. The next prime is 138316271. The reversal of 138316225 is 522613831.

It is not a de Polignac number, because 138316225 - 2¹ = 138316223 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138316223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76684 + ... + 78466.

It is an arithmetic number, because the mean of its divisors is an integer number (7466040).

Almost surely, 2^138316225 is an apocalyptic number.

It is an amenable number.

138316225 is a deficient number, since it is larger than the sum of its proper divisors (40868735).

138316225 is a wasteful number, since it uses less digits than its factorization.

138316225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1929 (or 1924 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 138316225 is about 11760.7918525922. The cubic root of 138316225 is about 517.1593439003.

The spelling of 138316225 in words is "one hundred thirty-eight million, three hundred sixteen thousand, two hundred twenty-five".