12381620 has 24 divisors (see below), whose sum is σ = 26122824. Its totient is φ = 4929536.

The previous prime is 12381599. The next prime is 12381641. The reversal of 12381620 is 2618321.

It is an interprime number because it is at equal distance from previous prime (12381599) and next prime (12381641).

It can be written as a sum of positive squares in 4 ways, for example, as 698896 + 11682724 = 836^2 + 3418^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3332 + ... + 5988.

It is an arithmetic number, because the mean of its divisors is an integer number (1088451).

Almost surely, 2^12381620 is an apocalyptic number.

12381620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12381620 is an abundant number, since it is smaller than the sum of its proper divisors (13741204).

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

12381620 is a wasteful number, since it uses less digits than its factorization.

12381620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2899 (or 2897 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 12381620 is about 3518.7526198925. The cubic root of 12381620 is about 231.3444882923.

Adding to 12381620 its reverse (2618321), we get a palindrome (14999941).

The spelling of 12381620 in words is "twelve million, three hundred eighty-one thousand, six hundred twenty".