138339866 has 8 divisors (see below), whose sum is σ = 237154080. Its totient is φ = 59288508.

The previous prime is 138339853. The next prime is 138339899. The reversal of 138339866 is 668933831.

138339866 is digitally balanced in base 2, because in such base 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 a self number, because there is not a number n which added to its sum of digits gives 138339866.

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, 4940696 + ... + 4940723.

It is an arithmetic number, because the mean of its divisors is an integer number (29644260).

Almost surely, 2^138339866 is an apocalyptic number.

138339866 is a deficient number, since it is larger than the sum of its proper divisors (98814214).

138339866 is an equidigital number, since it uses as much as digits as its factorization.

138339866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9881428.

The product of its digits is 559872, while the sum is 47.

The square root of 138339866 is about 11761.7968865306. The cubic root of 138339866 is about 517.1888065021.

The spelling of 138339866 in words is "one hundred thirty-eight million, three hundred thirty-nine thousand, eight hundred sixty-six".