138005236 has 12 divisors (see below), whose sum is σ = 241827012. Its totient is φ = 68911808.

The previous prime is 138005213. The next prime is 138005237. The reversal of 138005236 is 632500831.

138005236 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 62315236 + 75690000 = 7894^2 + 8700^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138005237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19225 + ... + 25408.

It is an arithmetic number, because the mean of its divisors is an integer number (20152251).

Almost surely, 2^138005236 is an apocalyptic number.

It is an amenable number.

138005236 is a deficient number, since it is larger than the sum of its proper divisors (103821776).

138005236 is a wasteful number, since it uses less digits than its factorization.

138005236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45410 (or 45408 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 138005236 is about 11747.5629813166. The cubic root of 138005236 is about 516.7714608570.

The spelling of 138005236 in words is "one hundred thirty-eight million, five thousand, two hundred thirty-six".