12386640 has 160 divisors (see below), whose sum is σ = 44925696. Its totient is φ = 2764800.

The previous prime is 12386611. The next prime is 12386657. The reversal of 12386640 is 4668321.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 12386598 and 12386607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122590 + ... + 122690.

Almost surely, 2^12386640 is an apocalyptic number.

12386640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12386640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22462848).

12386640 is an abundant number, since it is smaller than the sum of its proper divisors (32539056).

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

12386640 is a wasteful number, since it uses less digits than its factorization.

12386640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 12386640 is about 3519.4658685659. The cubic root of 12386640 is about 231.3757494793.

The spelling of 12386640 in words is "twelve million, three hundred eighty-six thousand, six hundred forty".