138243245 has 16 divisors (see below), whose sum is σ = 191472768. Its totient is φ = 93854400.

The previous prime is 138243233. The next prime is 138243247. The reversal of 138243245 is 542342831.

It is not a de Polignac number, because 138243245 - 2⁶ = 138243181 is a prime.

It is a super-2 number, since 2×138243245² = 38222389576260050, 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 (138243247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16019 + ... + 23088.

It is an arithmetic number, because the mean of its divisors is an integer number (11967048).

Almost surely, 2^138243245 is an apocalyptic number.

It is an amenable number.

138243245 is a deficient number, since it is larger than the sum of its proper divisors (53229523).

138243245 is a wasteful number, since it uses less digits than its factorization.

138243245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39220.

The product of its digits is 23040, while the sum is 32.

The square root of 138243245 is about 11757.6887609768. The cubic root of 138243245 is about 517.0683713749.

The spelling of 138243245 in words is "one hundred thirty-eight million, two hundred forty-three thousand, two hundred forty-five".