1985887 has 2 divisors, whose sum is σ = 1985888. Its totient is φ = 1985886.

The previous prime is 1985873. The next prime is 1985897. The reversal of 1985887 is 7885891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1985887 - 2⁷ = 1985759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1985897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992943 + 992944.

It is an arithmetic number, because the mean of its divisors is an integer number (992944).

2^1985887 is an apocalyptic number.

1985887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985887 is an equidigital number, since it uses as much as digits as its factorization.

1985887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 46.

The square root of 1985887 is about 1409.2150297240. The cubic root of 1985887 is about 125.6950507392.

The spelling of 1985887 in words is "one million, nine hundred eighty-five thousand, eight hundred eighty-seven".