1985677 has 2 divisors, whose sum is σ = 1985678. Its totient is φ = 1985676.

The previous prime is 1985663. The next prime is 1985689. The reversal of 1985677 is 7765891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1726596 + 259081 = 1314^2 + 509^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1985677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1985077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992838 + 992839.

It is an arithmetic number, because the mean of its divisors is an integer number (992839).

2^1985677 is an apocalyptic number.

It is an amenable number.

1985677 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985677 is an equidigital number, since it uses as much as digits as its factorization.

1985677 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 43.

The square root of 1985677 is about 1409.1405181883. The cubic root of 1985677 is about 125.6906199918.

It can be divided in two parts, 1985 and 677, that added together give a palindrome (2662).

The spelling of 1985677 in words is "one million, nine hundred eighty-five thousand, six hundred seventy-seven".