6881987 has 4 divisors (see below), whose sum is σ = 7865136. Its totient is φ = 5898840.

The previous prime is 6881981. The next prime is 6881989. The reversal of 6881987 is 7891886.

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

It is a cyclic number.

It is not a de Polignac number, because 6881987 - 2⁸ = 6881731 is a prime.

It is a d-powerful number, because it can be written as 6⁴ + 8 + 8³ + 1 + 9⁷ + 8⁷ + 7² .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6881981) 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, 491564 + ... + 491577.

It is an arithmetic number, because the mean of its divisors is an integer number (1966284).

Almost surely, 2^6881987 is an apocalyptic number.

6881987 is a deficient number, since it is larger than the sum of its proper divisors (983149).

6881987 is an equidigital number, since it uses as much as digits as its factorization.

6881987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983148.

The product of its digits is 193536, while the sum is 47.

The square root of 6881987 is about 2623.3541507010. The cubic root of 6881987 is about 190.2120163291.

The spelling of 6881987 in words is "six million, eight hundred eighty-one thousand, nine hundred eighty-seven".