12381550 has 24 divisors (see below), whose sum is σ = 23826600. Its totient is φ = 4781280.

The previous prime is 12381517. The next prime is 12381557. The reversal of 12381550 is 5518321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12381557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2820 + ... + 5719.

It is an arithmetic number, because the mean of its divisors is an integer number (992775).

Almost surely, 2^12381550 is an apocalyptic number.

12381550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12381550 is a deficient number, since it is larger than the sum of its proper divisors (11445050).

12381550 is a wasteful number, since it uses less digits than its factorization.

12381550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8580 (or 8575 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 12381550 is about 3518.7426731718. The cubic root of 12381550 is about 231.3440523196.

Adding to 12381550 its reverse (5518321), we get a palindrome (17899871).

The spelling of 12381550 in words is "twelve million, three hundred eighty-one thousand, five hundred fifty".