12400072 has 32 divisors (see below), whose sum is σ = 24975000. Its totient is φ = 5750784.

The previous prime is 12400049. The next prime is 12400097. The reversal of 12400072 is 27000421.

It can be written as a sum of positive squares in 4 ways, for example, as 11600836 + 799236 = 3406^2 + 894^2 .

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 in 7 ways as a sum of consecutive naturals, for example, 9304 + ... + 10552.

Almost surely, 2^12400072 is an apocalyptic number.

It is an amenable number.

12400072 is an abundant number, since it is smaller than the sum of its proper divisors (12574928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12400072 is a wasteful number, since it uses less digits than its factorization.

12400072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345 (or 1341 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 12400072 is about 3521.3735956300. The cubic root of 12400072 is about 231.4593534367.

Adding to 12400072 its reverse (27000421), we get a palindrome (39400493).

The spelling of 12400072 in words is "twelve million, four hundred thousand, seventy-two".