12816945 has 24 divisors (see below), whose sum is σ = 22319232. Its totient is φ = 6804000.

The previous prime is 12816931. The next prime is 12816949. The reversal of 12816945 is 54961821.

It is not a de Polignac number, because 12816945 - 2¹⁷ = 12685873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12816949) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11670 + ... + 12720.

It is an arithmetic number, because the mean of its divisors is an integer number (929968).

Almost surely, 2^12816945 is an apocalyptic number.

12816945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12816945 is a deficient number, since it is larger than the sum of its proper divisors (9502287).

12816945 is a wasteful number, since it uses less digits than its factorization.

12816945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333 (or 1330 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 12816945 is about 3580.0761165093. The cubic root of 12816945 is about 234.0245974581.

The spelling of 12816945 in words is "twelve million, eight hundred sixteen thousand, nine hundred forty-five".