138205033 has 4 divisors (see below), whose sum is σ = 138230928. Its totient is φ = 138179140.

The previous prime is 138205009. The next prime is 138205057. The reversal of 138205033 is 330502831.

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, and also an emirpimes, since its reverse is a distinct semiprime: 330502831 = 17 ⋅19441343.

It is an interprime number because it is at equal distance from previous prime (138205009) and next prime (138205057).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138205033 is a prime.

It is a super-2 number, since 2×138205033² = 38201262293062178, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138204989 and 138205007.

It is not an unprimeable number, because it can be changed into a prime (138205433) 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, 1663 + ... + 16708.

It is an arithmetic number, because the mean of its divisors is an integer number (34557732).

Almost surely, 2^138205033 is an apocalyptic number.

It is an amenable number.

138205033 is a deficient number, since it is larger than the sum of its proper divisors (25895).

138205033 is an equidigital number, since it uses as much as digits as its factorization.

138205033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25894.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 138205033 is about 11756.0636694431. The cubic root of 138205033 is about 517.0207257984.

Adding to 138205033 its reverse (330502831), we get a palindrome (468707864).

The spelling of 138205033 in words is "one hundred thirty-eight million, two hundred five thousand, thirty-three".