7855987 has 8 divisors (see below), whose sum is σ = 8302160. Its totient is φ = 7413120.

The previous prime is 7855973. The next prime is 7856011. The reversal of 7855987 is 7895587.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7855987 - 2¹⁵ = 7823219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7855987.

It is not an unprimeable number, because it can be changed into a prime (7855907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5287 + ... + 6607.

It is an arithmetic number, because the mean of its divisors is an integer number (1037770).

Almost surely, 2^7855987 is an apocalyptic number.

7855987 is a deficient number, since it is larger than the sum of its proper divisors (446173).

7855987 is a wasteful number, since it uses less digits than its factorization.

7855987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1653.

The product of its digits is 705600, while the sum is 49.

The square root of 7855987 is about 2802.8533675524. The cubic root of 7855987 is about 198.7926174712.

It can be divided in two parts, 78 and 55987, that added together give a palindrome (56065).

The spelling of 7855987 in words is "seven million, eight hundred fifty-five thousand, nine hundred eighty-seven".