2687857 has 2 divisors, whose sum is σ = 2687858. Its totient is φ = 2687856.

The previous prime is 2687851. The next prime is 2687869. The reversal of 2687857 is 7587862.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1442401 + 1245456 = 1201^2 + 1116^2 .

It is a cyclic number.

It is not a de Polignac number, because 2687857 - 2¹⁹ = 2163569 is a prime.

2687857 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2687851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1343928 + 1343929.

It is an arithmetic number, because the mean of its divisors is an integer number (1343929).

2^2687857 is an apocalyptic number.

It is an amenable number.

2687857 is a deficient number, since it is larger than the sum of its proper divisors (1).

2687857 is an equidigital number, since it uses as much as digits as its factorization.

2687857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 43.

The square root of 2687857 is about 1639.4685114390. The cubic root of 2687857 is about 139.0386001178.

The spelling of 2687857 in words is "two million, six hundred eighty-seven thousand, eight hundred fifty-seven".