7872817 has 2 divisors, whose sum is σ = 7872818. Its totient is φ = 7872816.

The previous prime is 7872803. The next prime is 7872863. The reversal of 7872817 is 7182787.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7834401 + 38416 = 2799^2 + 196^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7872817 is a prime.

7872817 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7872817.

It is not a weakly prime, because it can be changed into another prime (7872017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3936408 + 3936409.

It is an arithmetic number, because the mean of its divisors is an integer number (3936409).

Almost surely, 2^7872817 is an apocalyptic number.

It is an amenable number.

7872817 is a deficient number, since it is larger than the sum of its proper divisors (1).

7872817 is an equidigital number, since it uses as much as digits as its factorization.

7872817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43904, while the sum is 40.

The square root of 7872817 is about 2805.8540589275. The cubic root of 7872817 is about 198.9344750305.

The spelling of 7872817 in words is "seven million, eight hundred seventy-two thousand, eight hundred seventeen".