138623033 has 4 divisors (see below), whose sum is σ = 139175568. Its totient is φ = 138070500.

The previous prime is 138623029. The next prime is 138623059. The reversal of 138623033 is 330326831.

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 not a de Polignac number, because 138623033 - 2² = 138623029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138622987 and 138623005.

It is not an unprimeable number, because it can be changed into a prime (138623063) 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, 275891 + ... + 276392.

It is an arithmetic number, because the mean of its divisors is an integer number (34793892).

Almost surely, 2^138623033 is an apocalyptic number.

It is an amenable number.

138623033 is a deficient number, since it is larger than the sum of its proper divisors (552535).

138623033 is an equidigital number, since it uses as much as digits as its factorization.

138623033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552534.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 138623033 is about 11773.8283068847. The cubic root of 138623033 is about 517.5414428447.

Adding to 138623033 its reverse (330326831), we get a palindrome (468949864).

The spelling of 138623033 in words is "one hundred thirty-eight million, six hundred twenty-three thousand, thirty-three".