138136444 has 12 divisors (see below), whose sum is σ = 246300264. Its totient is φ = 67764944.

The previous prime is 138136423. The next prime is 138136451. The reversal of 138136444 is 444631831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325582 + ... + 326005.

It is an arithmetic number, because the mean of its divisors is an integer number (20525022).

Almost surely, 2^138136444 is an apocalyptic number.

It is an amenable number.

138136444 is a deficient number, since it is larger than the sum of its proper divisors (108163820).

138136444 is a wasteful number, since it uses less digits than its factorization.

138136444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651644 (or 651642 counting only the distinct ones).

The product of its digits is 27648, while the sum is 34.

The square root of 138136444 is about 11753.1461319938. The cubic root of 138136444 is about 516.9351818742.

The spelling of 138136444 in words is "one hundred thirty-eight million, one hundred thirty-six thousand, four hundred forty-four".