138284906 has 8 divisors (see below), whose sum is σ = 208095264. Its totient is φ = 68919820.

The previous prime is 138284903. The next prime is 138284911. The reversal of 138284906 is 609482831.

138284906 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (138284903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110540 + ... + 111783.

It is an arithmetic number, because the mean of its divisors is an integer number (26011908).

Almost surely, 2^138284906 is an apocalyptic number.

138284906 is a deficient number, since it is larger than the sum of its proper divisors (69810358).

138284906 is a wasteful number, since it uses less digits than its factorization.

138284906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222636.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 138284906 is about 11759.4602767304. The cubic root of 138284906 is about 517.1203074192.

The spelling of 138284906 in words is "one hundred thirty-eight million, two hundred eighty-four thousand, nine hundred six".