138417638 has 32 divisors (see below), whose sum is σ = 230428800. Its totient is φ = 62060544.

The previous prime is 138417607. The next prime is 138417649. The reversal of 138417638 is 836714831.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 138417595 and 138417604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77006 + ... + 78782.

It is an arithmetic number, because the mean of its divisors is an integer number (7200900).

Almost surely, 2^138417638 is an apocalyptic number.

138417638 is a deficient number, since it is larger than the sum of its proper divisors (92011162).

138417638 is a wasteful number, since it uses less digits than its factorization.

138417638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904.

The product of its digits is 96768, while the sum is 41.

The square root of 138417638 is about 11765.1025494893. The cubic root of 138417638 is about 517.2857061977.

The spelling of 138417638 in words is "one hundred thirty-eight million, four hundred seventeen thousand, six hundred thirty-eight".