138532366 has 32 divisors (see below), whose sum is σ = 251799552. Its totient is φ = 55896480.

The previous prime is 138532313. The next prime is 138532367. The reversal of 138532366 is 663235831.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138532367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11745 + ... + 20371.

It is an arithmetic number, because the mean of its divisors is an integer number (7868736).

Almost surely, 2^138532366 is an apocalyptic number.

138532366 is a deficient number, since it is larger than the sum of its proper divisors (113267186).

138532366 is a wasteful number, since it uses less digits than its factorization.

138532366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8704.

The product of its digits is 77760, while the sum is 37.

The square root of 138532366 is about 11769.9773151863. The cubic root of 138532366 is about 517.4285848226.

The spelling of 138532366 in words is "one hundred thirty-eight million, five hundred thirty-two thousand, three hundred sixty-six".