138633659 has 4 divisors (see below), whose sum is σ = 143414160. Its totient is φ = 133853160.

The previous prime is 138633641. The next prime is 138633679. The reversal of 138633659 is 956336831.

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 138633659 - 2⁸ = 138633403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138633629) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2390207 + ... + 2390264.

It is an arithmetic number, because the mean of its divisors is an integer number (35853540).

Almost surely, 2^138633659 is an apocalyptic number.

138633659 is a deficient number, since it is larger than the sum of its proper divisors (4780501).

138633659 is an equidigital number, since it uses as much as digits as its factorization.

138633659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4780500.

The product of its digits is 349920, while the sum is 44.

The square root of 138633659 is about 11774.2795533315. The cubic root of 138633659 is about 517.5546663684.

The spelling of 138633659 in words is "one hundred thirty-eight million, six hundred thirty-three thousand, six hundred fifty-nine".