12400033 has 4 divisors (see below), whose sum is σ = 12428100. Its totient is φ = 12371968.

The previous prime is 12400009. The next prime is 12400043. The reversal of 12400033 is 33000421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2458624 + 9941409 = 1568^2 + 3153^2 .

It is a cyclic number.

It is not a de Polignac number, because 12400033 - 2⁵ = 12400001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12399986 and 12400022.

It is not an unprimeable number, because it can be changed into a prime (12400043) 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, 13360 + ... + 14257.

It is an arithmetic number, because the mean of its divisors is an integer number (3107025).

Almost surely, 2^12400033 is an apocalyptic number.

It is an amenable number.

12400033 is a deficient number, since it is larger than the sum of its proper divisors (28067).

12400033 is an equidigital number, since it uses as much as digits as its factorization.

12400033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28066.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 12400033 is about 3521.3680580138. The cubic root of 12400033 is about 231.4591107789.

Adding to 12400033 its reverse (33000421), we get a palindrome (45400454).

The spelling of 12400033 in words is "twelve million, four hundred thousand, thirty-three".