12129386 has 4 divisors (see below), whose sum is σ = 18194082. Its totient is φ = 6064692.

The previous prime is 12129379. The next prime is 12129407. The reversal of 12129386 is 68392121.

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., 6345361 + 5784025 = 2519^2 + 2405^2 .

It is an unprimeable number.

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, 3032345 + ... + 3032348.

Almost surely, 2^12129386 is an apocalyptic number.

12129386 is a deficient number, since it is larger than the sum of its proper divisors (6064696).

12129386 is an equidigital number, since it uses as much as digits as its factorization.

12129386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6064695.

The product of its digits is 5184, while the sum is 32.

The square root of 12129386 is about 3482.7268052490. The cubic root of 12129386 is about 229.7627421068.

The spelling of 12129386 in words is "twelve million, one hundred twenty-nine thousand, three hundred eighty-six".