12840826 has 4 divisors (see below), whose sum is σ = 19261242. Its totient is φ = 6420412.

The previous prime is 12840811. The next prime is 12840833. The reversal of 12840826 is 62804821.

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., 7845601 + 4995225 = 2801^2 + 2235^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210205 + ... + 3210208.

Almost surely, 2^12840826 is an apocalyptic number.

12840826 is a deficient number, since it is larger than the sum of its proper divisors (6420416).

12840826 is an equidigital number, since it uses as much as digits as its factorization.

12840826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6420415.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 12840826 is about 3583.4098286409. The cubic root of 12840826 is about 234.1698550046.

The spelling of 12840826 in words is "twelve million, eight hundred forty thousand, eight hundred twenty-six".