12400664 has 8 divisors (see below), whose sum is σ = 23251260. Its totient is φ = 6200328.

The previous prime is 12400643. The next prime is 12400669. The reversal of 12400664 is 46600421.

It is a happy number.

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

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 as a sum of consecutive naturals, namely, 775034 + ... + 775049.

Almost surely, 2^12400664 is an apocalyptic number.

It is an amenable number.

12400664 is a deficient number, since it is larger than the sum of its proper divisors (10850596).

12400664 is a wasteful number, since it uses less digits than its factorization.

12400664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550089 (or 1550085 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 12400664 is about 3521.4576527342. The cubic root of 12400664 is about 231.4630367959.

The spelling of 12400664 in words is "twelve million, four hundred thousand, six hundred sixty-four".