12409402 has 4 divisors (see below), whose sum is σ = 18614106. Its totient is φ = 6204700.

The previous prime is 12409391. The next prime is 12409421. The reversal of 12409402 is 20490421.

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., 8946081 + 3463321 = 2991^2 + 1861^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3102349 + ... + 3102352.

Almost surely, 2^12409402 is an apocalyptic number.

12409402 is a deficient number, since it is larger than the sum of its proper divisors (6204704).

12409402 is an equidigital number, since it uses as much as digits as its factorization.

12409402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6204703.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 12409402 is about 3522.6981136623. The cubic root of 12409402 is about 231.5173900453.

Adding to 12409402 its reverse (20490421), we get a palindrome (32899823).

The spelling of 12409402 in words is "twelve million, four hundred nine thousand, four hundred two".