138396566 has 64 divisors (see below), whose sum is σ = 276950016. Its totient is φ = 50265600.

The previous prime is 138396527. The next prime is 138396569. The reversal of 138396566 is 665693831.

138396566 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 138396566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138396569) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 144746 + ... + 145698.

It is an arithmetic number, because the mean of its divisors is an integer number (4327344).

Almost surely, 2^138396566 is an apocalyptic number.

138396566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

138396566 is a wasteful number, since it uses less digits than its factorization.

138396566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037.

The product of its digits is 699840, while the sum is 47.

The square root of 138396566 is about 11764.2069855983. The cubic root of 138396566 is about 517.2594552137.

The spelling of 138396566 in words is "one hundred thirty-eight million, three hundred ninety-six thousand, five hundred sixty-six".