12381567 has 24 divisors (see below), whose sum is σ = 18947712. Its totient is φ = 7172880.

The previous prime is 12381557. The next prime is 12381583. The reversal of 12381567 is 76518321.

It is not a de Polignac number, because 12381567 - 2¹⁵ = 12348799 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 7608 + ... + 9090.

It is an arithmetic number, because the mean of its divisors is an integer number (789488).

Almost surely, 2^12381567 is an apocalyptic number.

12381567 is a deficient number, since it is larger than the sum of its proper divisors (6566145).

12381567 is a wasteful number, since it uses less digits than its factorization.

12381567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1531 (or 1520 counting only the distinct ones).

The product of its digits is 10080, while the sum is 33.

The square root of 12381567 is about 3518.7450888065. The cubic root of 12381567 is about 231.3441581988.

Adding to 12381567 its reverse (76518321), we get a palindrome (88899888).

The spelling of 12381567 in words is "twelve million, three hundred eighty-one thousand, five hundred sixty-seven".