138431606 has 16 divisors (see below), whose sum is σ = 218939760. Its totient is φ = 65463840.

The previous prime is 138431603. The next prime is 138431627. The reversal of 138431606 is 606134831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138431603) 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, 23036 + ... + 28416.

It is an arithmetic number, because the mean of its divisors is an integer number (13683735).

Almost surely, 2^138431606 is an apocalyptic number.

138431606 is a deficient number, since it is larger than the sum of its proper divisors (80508154).

138431606 is a wasteful number, since it uses less digits than its factorization.

138431606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6079.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 138431606 is about 11765.6961544993. The cubic root of 138431606 is about 517.3031057233.

The spelling of 138431606 in words is "one hundred thirty-eight million, four hundred thirty-one thousand, six hundred six".