12400216 has 8 divisors (see below), whose sum is σ = 23250420. Its totient is φ = 6200104.

The previous prime is 12400183. The next prime is 12400231. The reversal of 12400216 is 61200421.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 12400216.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 775006 + ... + 775021.

Almost surely, 2^12400216 is an apocalyptic number.

It is an amenable number.

12400216 is a deficient number, since it is larger than the sum of its proper divisors (10850204).

12400216 is a wasteful number, since it uses less digits than its factorization.

12400216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550033 (or 1550029 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 12400216 is about 3521.3940421373. The cubic root of 12400216 is about 231.4602493997.

Adding to 12400216 its reverse (61200421), we get a palindrome (73600637).

The spelling of 12400216 in words is "twelve million, four hundred thousand, two hundred sixteen".