7871385 has 16 divisors (see below), whose sum is σ = 12902400. Its totient is φ = 4095360.

The previous prime is 7871351. The next prime is 7871387. The reversal of 7871385 is 5831787.

It is not a de Polignac number, because 7871385 - 2¹⁰ = 7870361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7871387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5785 + ... + 7014.

It is an arithmetic number, because the mean of its divisors is an integer number (806400).

Almost surely, 2^7871385 is an apocalyptic number.

It is an amenable number.

7871385 is a deficient number, since it is larger than the sum of its proper divisors (5031015).

7871385 is a wasteful number, since it uses less digits than its factorization.

7871385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12848.

The product of its digits is 47040, while the sum is 39.

The square root of 7871385 is about 2805.5988665524. The cubic root of 7871385 is about 198.9224127898.

It can be divided in two parts, 7871 and 385, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 7871385 in words is "seven million, eight hundred seventy-one thousand, three hundred eighty-five".