138968236 has 24 divisors (see below), whose sum is σ = 267006096. Its totient is φ = 62761920.

The previous prime is 138968233. The next prime is 138968281. The reversal of 138968236 is 632869831.

It is not an unprimeable number, because it can be changed into a prime (138968233) 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, 3151 + ... + 16966.

It is an arithmetic number, because the mean of its divisors is an integer number (11125254).

Almost surely, 2^138968236 is an apocalyptic number.

It is an amenable number.

138968236 is a deficient number, since it is larger than the sum of its proper divisors (128037860).

138968236 is a wasteful number, since it uses less digits than its factorization.

138968236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20289 (or 20287 counting only the distinct ones).

The product of its digits is 373248, while the sum is 46.

The square root of 138968236 is about 11788.4789519259. The cubic root of 138968236 is about 517.9706855203.

The spelling of 138968236 in words is "one hundred thirty-eight million, nine hundred sixty-eight thousand, two hundred thirty-six".