12451216 has 10 divisors (see below), whose sum is σ = 24124262. Its totient is φ = 6225600.

The previous prime is 12451169. The next prime is 12451217. The reversal of 12451216 is 61215421.

It can be written as a sum of positive squares in only one way, i.e., 10863616 + 1587600 = 3296^2 + 1260^2 .

It is not an unprimeable number, because it can be changed into a prime (12451217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389085 + ... + 389116.

Almost surely, 2^12451216 is an apocalyptic number.

12451216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12451216 is a deficient number, since it is larger than the sum of its proper divisors (11673046).

12451216 is an equidigital number, since it uses as much as digits as its factorization.

12451216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778209 (or 778203 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

The square root of 12451216 is about 3528.6280620094. The cubic root of 12451216 is about 231.7771343724. Note that the first 3 decimals are identical.

Adding to 12451216 its reverse (61215421), we get a palindrome (73666637).

The spelling of 12451216 in words is "twelve million, four hundred fifty-one thousand, two hundred sixteen".