7870865 has 4 divisors (see below), whose sum is σ = 9445044. Its totient is φ = 6296688.

The previous prime is 7870823. The next prime is 7870867. The reversal of 7870865 is 5680787.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4804864 + 3066001 = 2192^2 + 1751^2 .

It is a cyclic number.

It is not a de Polignac number, because 7870865 - 2¹² = 7866769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7870867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 787082 + ... + 787091.

It is an arithmetic number, because the mean of its divisors is an integer number (2361261).

Almost surely, 2^7870865 is an apocalyptic number.

It is an amenable number.

7870865 is a deficient number, since it is larger than the sum of its proper divisors (1574179).

7870865 is a wasteful number, since it uses less digits than its factorization.

7870865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574178.

The product of its (nonzero) digits is 94080, while the sum is 41.

The square root of 7870865 is about 2805.5061931851. The cubic root of 7870865 is about 198.9180322844.

The spelling of 7870865 in words is "seven million, eight hundred seventy thousand, eight hundred sixty-five".