12280649 has 4 divisors (see below), whose sum is σ = 12288900. Its totient is φ = 12272400.

The previous prime is 12280621. The next prime is 12280661. The reversal of 12280649 is 94608221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8791225 + 3489424 = 2965^2 + 1868^2 .

It is a cyclic number.

It is not a de Polignac number, because 12280649 - 2¹² = 12276553 is a prime.

It is a super-2 number, since 2×12280649² = 301628679722402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12280249) 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 in 3 ways as a sum of consecutive naturals, for example, 1202 + ... + 5099.

It is an arithmetic number, because the mean of its divisors is an integer number (3072225).

Almost surely, 2^12280649 is an apocalyptic number.

It is an amenable number.

12280649 is a deficient number, since it is larger than the sum of its proper divisors (8251).

12280649 is an equidigital number, since it uses as much as digits as its factorization.

12280649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8250.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 12280649 is about 3504.3756933297. The cubic root of 12280649 is about 230.7139065468.

The spelling of 12280649 in words is "twelve million, two hundred eighty thousand, six hundred forty-nine".