138973633 has 4 divisors (see below), whose sum is σ = 140272560. Its totient is φ = 137674708.

The previous prime is 138973621. The next prime is 138973643. The reversal of 138973633 is 336379831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138973633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138973633.

It is not an unprimeable number, because it can be changed into a prime (138973643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 649303 + ... + 649516.

It is an arithmetic number, because the mean of its divisors is an integer number (35068140).

Almost surely, 2^138973633 is an apocalyptic number.

It is an amenable number.

138973633 is a deficient number, since it is larger than the sum of its proper divisors (1298927).

138973633 is a wasteful number, since it uses less digits than its factorization.

138973633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298926.

The product of its digits is 244944, while the sum is 43.

The square root of 138973633 is about 11788.7078596426. The cubic root of 138973633 is about 517.9773907734.

The spelling of 138973633 in words is "one hundred thirty-eight million, nine hundred seventy-three thousand, six hundred thirty-three".