12381537 has 16 divisors (see below), whose sum is σ = 18916352. Its totient is φ = 7056720.

The previous prime is 12381517. The next prime is 12381557. The reversal of 12381537 is 73518321.

12381537 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12381517) and next prime (12381557).

It is not a de Polignac number, because 12381537 - 2⁷ = 12381409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12381517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14862 + ... + 15672.

It is an arithmetic number, because the mean of its divisors is an integer number (1182272).

Almost surely, 2^12381537 is an apocalyptic number.

It is an amenable number.

12381537 is a deficient number, since it is larger than the sum of its proper divisors (6534815).

12381537 is an equidigital number, since it uses as much as digits as its factorization.

12381537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1548.

The product of its digits is 5040, while the sum is 30.

The square root of 12381537 is about 3518.7408259205. The cubic root of 12381537 is about 231.3439713531.

Adding to 12381537 its reverse (73518321), we get a palindrome (85899858).

It can be divided in two parts, 1238 and 1537, that added together give a triangular number (2775 = T₇₄).

The spelling of 12381537 in words is "twelve million, three hundred eighty-one thousand, five hundred thirty-seven".