12120505 has 8 divisors (see below), whose sum is σ = 14689224. Its totient is φ = 9600000.

The previous prime is 12120503. The next prime is 12120509. The reversal of 12120505 is 50502121.

It can be written as a sum of positive squares in 4 ways, for example, as 2732409 + 9388096 = 1653^2 + 3064^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12120505 - 2¹ = 12120503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12120503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11496 + ... + 12505.

It is an arithmetic number, because the mean of its divisors is an integer number (1836153).

Almost surely, 2^12120505 is an apocalyptic number.

It is an amenable number.

12120505 is a deficient number, since it is larger than the sum of its proper divisors (2568719).

12120505 is a wasteful number, since it uses less digits than its factorization.

12120505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24107.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 12120505 is about 3481.4515650803. The cubic root of 12120505 is about 229.7066518499.

Adding to 12120505 its reverse (50502121), we get a palindrome (62622626).

The spelling of 12120505 in words is "twelve million, one hundred twenty thousand, five hundred five".