12109345 has 8 divisors (see below), whose sum is σ = 14553000. Its totient is φ = 9672960.

The previous prime is 12109343. The next prime is 12109367. The reversal of 12109345 is 54390121.

It can be written as a sum of positive squares in 4 ways, for example, as 61504 + 12047841 = 248^2 + 3471^2 .

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

It is not a de Polignac number, because 12109345 - 2¹ = 12109343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12109343) 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, 3031 + ... + 5779.

It is an arithmetic number, because the mean of its divisors is an integer number (1819125).

Almost surely, 2^12109345 is an apocalyptic number.

It is an amenable number.

12109345 is a deficient number, since it is larger than the sum of its proper divisors (2443655).

12109345 is an equidigital number, since it uses as much as digits as its factorization.

12109345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3635.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 12109345 is about 3479.8484162388. The cubic root of 12109345 is about 229.6361291165.

Adding to 12109345 its reverse (54390121), we get a palindrome (66499466).

The spelling of 12109345 in words is "twelve million, one hundred nine thousand, three hundred forty-five".