138475766 has 16 divisors (see below), whose sum is σ = 244027728. Its totient is φ = 58101600.

The previous prime is 138475759. The next prime is 138475849. The reversal of 138475766 is 667574831.

It is a self number, because there is not a number n which added to its sum of digits gives 138475766.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241805 + ... + 242376.

It is an arithmetic number, because the mean of its divisors is an integer number (15251733).

Almost surely, 2^138475766 is an apocalyptic number.

138475766 is a deficient number, since it is larger than the sum of its proper divisors (105551962).

138475766 is a wasteful number, since it uses less digits than its factorization.

138475766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484207.

The product of its digits is 846720, while the sum is 47.

The square root of 138475766 is about 11767.5726468971. The cubic root of 138475766 is about 517.3581068345.

The spelling of 138475766 in words is "one hundred thirty-eight million, four hundred seventy-five thousand, seven hundred sixty-six".