12120645 has 16 divisors (see below), whose sum is σ = 19918080. Its totient is φ = 6289344.

The previous prime is 12120631. The next prime is 12120649. The reversal of 12120645 is 54602121.

12120645 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12120645 - 2⁴ = 12120629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120649) 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, 10365 + ... + 11474.

It is an arithmetic number, because the mean of its divisors is an integer number (1244880).

Almost surely, 2^12120645 is an apocalyptic number.

12120645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12120645 is a deficient number, since it is larger than the sum of its proper divisors (7797435).

12120645 is a wasteful number, since it uses less digits than its factorization.

12120645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21884.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 12120645 is about 3481.4716715780. The cubic root of 12120645 is about 229.7075362687.

Adding to 12120645 its reverse (54602121), we get a palindrome (66722766).

The spelling of 12120645 in words is "twelve million, one hundred twenty thousand, six hundred forty-five".