12138233 has 4 divisors (see below), whose sum is σ = 12170640. Its totient is φ = 12105828.

The previous prime is 12138229. The next prime is 12138251. The reversal of 12138233 is 33283121.

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: 33283121 = 67 ⋅496763.

It is a cyclic number.

It is not a de Polignac number, because 12138233 - 2² = 12138229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12138199 and 12138208.

It is not an unprimeable number, because it can be changed into a prime (12138223) 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, 15635 + ... + 16392.

It is an arithmetic number, because the mean of its divisors is an integer number (3042660).

Almost surely, 2^12138233 is an apocalyptic number.

It is an amenable number.

12138233 is a deficient number, since it is larger than the sum of its proper divisors (32407).

12138233 is an equidigital number, since it uses as much as digits as its factorization.

12138233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32406.

The product of its digits is 864, while the sum is 23.

The square root of 12138233 is about 3483.9966991948. The cubic root of 12138233 is about 229.8185904125.

Adding to 12138233 its sum of digits (23), we get a square (12138256 = 3484²).

The spelling of 12138233 in words is "twelve million, one hundred thirty-eight thousand, two hundred thirty-three".