6987857 has 4 divisors (see below), whose sum is σ = 7176756. Its totient is φ = 6798960.

The previous prime is 6987847. The next prime is 6987863. The reversal of 6987857 is 7587896.

It is a happy number.

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 5202961 + 1784896 = 2281^2 + 1336^2 .

It is a cyclic number.

It is not a de Polignac number, because 6987857 - 2⁶ = 6987793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6987817) 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, 94394 + ... + 94467.

It is an arithmetic number, because the mean of its divisors is an integer number (1794189).

Almost surely, 2^6987857 is an apocalyptic number.

It is an amenable number.

6987857 is a deficient number, since it is larger than the sum of its proper divisors (188899).

6987857 is a wasteful number, since it uses less digits than its factorization.

6987857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188898.

The product of its digits is 846720, while the sum is 50.

The square root of 6987857 is about 2643.4555036921. The cubic root of 6987857 is about 191.1824412865.

The spelling of 6987857 in words is "six million, nine hundred eighty-seven thousand, eight hundred fifty-seven".