12400660 has 12 divisors (see below), whose sum is σ = 26041428. Its totient is φ = 4960256.

The previous prime is 12400643. The next prime is 12400669. The reversal of 12400660 is 6600421.

It can be written as a sum of positive squares in 2 ways, for example, as 3944196 + 8456464 = 1986^2 + 2908^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12400669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309997 + ... + 310036.

It is an arithmetic number, because the mean of its divisors is an integer number (2170119).

Almost surely, 2^12400660 is an apocalyptic number.

12400660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12400660 is an abundant number, since it is smaller than the sum of its proper divisors (13640768).

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

12400660 is a wasteful number, since it uses less digits than its factorization.

12400660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620042 (or 620040 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 12400660 is about 3521.4570847875. The cubic root of 12400660 is about 231.4630119087.

The spelling of 12400660 in words is "twelve million, four hundred thousand, six hundred sixty".