138135245 has 8 divisors (see below), whose sum is σ = 170242584. Its totient is φ = 107521344.

The previous prime is 138135241. The next prime is 138135271. The reversal of 138135245 is 542531831.

It can be written as a sum of positive squares in 4 ways, for example, as 33339076 + 104796169 = 5774^2 + 10237^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138135245 - 2² = 138135241 is a prime.

It is a super-2 number, since 2×138135245² = 38162691822420050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138135241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 373154 + ... + 373523.

It is an arithmetic number, because the mean of its divisors is an integer number (21280323).

Almost surely, 2^138135245 is an apocalyptic number.

It is an amenable number.

138135245 is a deficient number, since it is larger than the sum of its proper divisors (32107339).

138135245 is an equidigital number, since it uses as much as digits as its factorization.

138135245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746719.

The product of its digits is 14400, while the sum is 32.

The square root of 138135245 is about 11753.0951242641. The cubic root of 138135245 is about 516.9336862344.

The spelling of 138135245 in words is "one hundred thirty-eight million, one hundred thirty-five thousand, two hundred forty-five".