138633307 has 4 divisors (see below), whose sum is σ = 140006016. Its totient is φ = 137260600.

The previous prime is 138633301. The next prime is 138633331. The reversal of 138633307 is 703336831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138633307 - 2¹⁹ = 138109019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138633301) 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 3 ways as a sum of consecutive naturals, for example, 686203 + ... + 686404.

It is an arithmetic number, because the mean of its divisors is an integer number (35001504).

Almost surely, 2^138633307 is an apocalyptic number.

138633307 is a deficient number, since it is larger than the sum of its proper divisors (1372709).

138633307 is a wasteful number, since it uses less digits than its factorization.

138633307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372708.

The product of its (nonzero) digits is 27216, while the sum is 34.

The square root of 138633307 is about 11774.2646054860. The cubic root of 138633307 is about 517.5542283328.

The spelling of 138633307 in words is "one hundred thirty-eight million, six hundred thirty-three thousand, three hundred seven".