12280738 has 4 divisors (see below), whose sum is σ = 18421110. Its totient is φ = 6140368.

The previous prime is 12280733. The next prime is 12280753. The reversal of 12280738 is 83708221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83708221 = 17 ⋅4924013.

It can be written as a sum of positive squares in only one way, i.e., 11992369 + 288369 = 3463^2 + 537^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (12280733) 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 as a sum of consecutive naturals, namely, 3070183 + ... + 3070186.

Almost surely, 2^12280738 is an apocalyptic number.

12280738 is a deficient number, since it is larger than the sum of its proper divisors (6140372).

12280738 is an equidigital number, since it uses as much as digits as its factorization.

12280738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6140371.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 12280738 is about 3504.3883917169. The cubic root of 12280738 is about 230.7144638868.

Adding to 12280738 its reverse (83708221), we get a palindrome (95988959).

The spelling of 12280738 in words is "twelve million, two hundred eighty thousand, seven hundred thirty-eight".