12920817 has 64 divisors (see below), whose sum is σ = 23224320. Its totient is φ = 6200064.

The previous prime is 12920813. The next prime is 12920819. The reversal of 12920817 is 71802921.

It is not a de Polignac number, because 12920817 - 2² = 12920813 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12920813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 243763 + ... + 243815.

It is an arithmetic number, because the mean of its divisors is an integer number (362880).

Almost surely, 2^12920817 is an apocalyptic number.

It is an amenable number.

12920817 is a deficient number, since it is larger than the sum of its proper divisors (10303503).

12920817 is a wasteful number, since it uses less digits than its factorization.

12920817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 12920817 is about 3594.5537970658. The cubic root of 12920817 is about 234.6550968796.

The spelling of 12920817 in words is "twelve million, nine hundred twenty thousand, eight hundred seventeen".