7872869 has 2 divisors, whose sum is σ = 7872870. Its totient is φ = 7872868.

The previous prime is 7872863. The next prime is 7872871. The reversal of 7872869 is 9682787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4120900 + 3751969 = 2030^2 + 1937^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7872869 is a prime.

It is a super-2 number, since 2×7872869² = 123964132582322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 7872871, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 7⁴ + 8 + 7⁸ + 2 + 8⁷ + 6⁵ + 9³ .

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7872863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3936434 + 3936435.

It is an arithmetic number, because the mean of its divisors is an integer number (3936435).

Almost surely, 2^7872869 is an apocalyptic number.

It is an amenable number.

7872869 is a deficient number, since it is larger than the sum of its proper divisors (1).

7872869 is an equidigital number, since it uses as much as digits as its factorization.

7872869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 47.

The square root of 7872869 is about 2805.8633252530. The cubic root of 7872869 is about 198.9349130173.

The spelling of 7872869 in words is "seven million, eight hundred seventy-two thousand, eight hundred sixty-nine".