12133778 has 4 divisors (see below), whose sum is σ = 18200670. Its totient is φ = 6066888.

The previous prime is 12133777. The next prime is 12133787. The reversal of 12133778 is 87733121.

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

It can be written as a sum of positive squares in only one way, i.e., 10804369 + 1329409 = 3287^2 + 1153^2 .

It is not an unprimeable number, because it can be changed into a prime (12133777) 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 as a sum of consecutive naturals, namely, 3033443 + ... + 3033446.

Almost surely, 2^12133778 is an apocalyptic number.

12133778 is a deficient number, since it is larger than the sum of its proper divisors (6066892).

12133778 is an equidigital number, since it uses as much as digits as its factorization.

12133778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6066891.

The product of its digits is 7056, while the sum is 32.

The square root of 12133778 is about 3483.3572885939. The cubic root of 12133778 is about 229.7904708033.

Adding to 12133778 its reverse (87733121), we get a palindrome (99866899).

The spelling of 12133778 in words is "twelve million, one hundred thirty-three thousand, seven hundred seventy-eight".