12012640 has 24 divisors (see below), whose sum is σ = 28380240. Its totient is φ = 4804992.

The previous prime is 12012629. The next prime is 12012643. The reversal of 12012640 is 4621021.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37380 + ... + 37699.

It is an arithmetic number, because the mean of its divisors is an integer number (1182510).

Almost surely, 2^12012640 is an apocalyptic number.

12012640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12012640 is an abundant number, since it is smaller than the sum of its proper divisors (16367600).

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

12012640 is an equidigital number, since it uses as much as digits as its factorization.

12012640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75094 (or 75086 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 12012640 is about 3465.9255618089. The cubic root of 12012640 is about 229.0232046812.

Adding to 12012640 its reverse (4621021), we get a palindrome (16633661).

The spelling of 12012640 in words is "twelve million, twelve thousand, six hundred forty".