138046906 has 16 divisors (see below), whose sum is σ = 215758080. Its totient is φ = 66169440.

The previous prime is 138046903. The next prime is 138046939. The reversal of 138046906 is 609640831.

It is not an unprimeable number, because it can be changed into a prime (138046903) 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, 3771 + ... + 17038.

It is an arithmetic number, because the mean of its divisors is an integer number (13484880).

Almost surely, 2^138046906 is an apocalyptic number.

138046906 is a deficient number, since it is larger than the sum of its proper divisors (77711174).

138046906 is a wasteful number, since it uses less digits than its factorization.

138046906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20949.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 138046906 is about 11749.3364067934. The cubic root of 138046906 is about 516.8234678204.

The spelling of 138046906 in words is "one hundred thirty-eight million, forty-six thousand, nine hundred six".