12440002 has 4 divisors (see below), whose sum is σ = 18660006. Its totient is φ = 6220000.

The previous prime is 12439979. The next prime is 12440009. The reversal of 12440002 is 20004421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20004421 = 283 ⋅70687.

It can be written as a sum of positive squares in only one way, i.e., 10426441 + 2013561 = 3229^2 + 1419^2 .

It is a Smith number, since the sum of its digits (13) 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 (12440009) 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, 3109999 + ... + 3110002.

Almost surely, 2^12440002 is an apocalyptic number.

12440002 is a deficient number, since it is larger than the sum of its proper divisors (6220004).

12440002 is an equidigital number, since it uses as much as digits as its factorization.

12440002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6220003.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 12440002 is about 3527.0387012337. The cubic root of 12440002 is about 231.7075312785.

Adding to 12440002 its reverse (20004421), we get a palindrome (32444423).

The spelling of 12440002 in words is "twelve million, four hundred forty thousand, two".