7872865 has 48 divisors (see below), whose sum is σ = 12859776. Its totient is φ = 4530240.

The previous prime is 7872863. The next prime is 7872869. The reversal of 7872865 is 5682787.

It is a happy number.

It is not a de Polignac number, because 7872865 - 2¹ = 7872863 is a prime.

It is a Duffinian number.

7872865 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7872863) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 605599 + ... + 605611.

It is an arithmetic number, because the mean of its divisors is an integer number (267912).

Almost surely, 2^7872865 is an apocalyptic number.

It is an amenable number.

7872865 is a deficient number, since it is larger than the sum of its proper divisors (4986911).

7872865 is a wasteful number, since it uses less digits than its factorization.

7872865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71 (or 36 counting only the distinct ones).

The product of its digits is 188160, while the sum is 43.

The square root of 7872865 is about 2805.8626124598. The cubic root of 7872865 is about 198.9348793261.

The spelling of 7872865 in words is "seven million, eight hundred seventy-two thousand, eight hundred sixty-five".