12381720 has 64 divisors (see below), whose sum is σ = 40007520. Its totient is φ = 3047424.

The previous prime is 12381709. The next prime is 12381731. The reversal of 12381720 is 2718321.

It is an interprime number because it is at equal distance from previous prime (12381709) and next prime (12381731).

It is a Harshad number since it is a multiple of its sum of digits (24).

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 15 ways as a sum of consecutive naturals, for example, 2409 + ... + 5528.

Almost surely, 2^12381720 is an apocalyptic number.

12381720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12381720 is an abundant number, since it is smaller than the sum of its proper divisors (27625800).

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

12381720 is a wasteful number, since it uses less digits than its factorization.

12381720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7964 (or 7960 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 12381720 is about 3518.7668294447. The cubic root of 12381720 is about 231.3451111076.

The spelling of 12381720 in words is "twelve million, three hundred eighty-one thousand, seven hundred twenty".