1985987 has 2 divisors, whose sum is σ = 1985988. Its totient is φ = 1985986.

The previous prime is 1985939. The next prime is 1985989. The reversal of 1985987 is 7895891.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1985987 - 2¹² = 1981891 is a prime.

Together with 1985989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1985989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992993 + 992994.

It is an arithmetic number, because the mean of its divisors is an integer number (992994).

2^1985987 is an apocalyptic number.

1985987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985987 is an equidigital number, since it uses as much as digits as its factorization.

1985987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 47.

The square root of 1985987 is about 1409.2505100230. The cubic root of 1985987 is about 125.6971605091.

The spelling of 1985987 in words is "one million, nine hundred eighty-five thousand, nine hundred eighty-seven".