138617245 has 32 divisors (see below), whose sum is σ = 186923520. Its totient is φ = 97977600.

The previous prime is 138617239. The next prime is 138617249. The reversal of 138617245 is 542716831.

It is not a de Polignac number, because 138617245 - 2²⁷ = 4399517 is a prime.

It is a super-2 number, since 2×138617245² = 38429481222780050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138617249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 284392 + ... + 284878.

It is an arithmetic number, because the mean of its divisors is an integer number (5841360).

Almost surely, 2^138617245 is an apocalyptic number.

It is an amenable number.

138617245 is a deficient number, since it is larger than the sum of its proper divisors (48306275).

138617245 is a wasteful number, since it uses less digits than its factorization.

138617245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685.

The product of its digits is 40320, while the sum is 37.

The square root of 138617245 is about 11773.5825049133. The cubic root of 138617245 is about 517.5342396849.

The spelling of 138617245 in words is "one hundred thirty-eight million, six hundred seventeen thousand, two hundred forty-five".