1685953 has 2 divisors, whose sum is σ = 1685954. Its totient is φ = 1685952.

The previous prime is 1685951. The next prime is 1685963. The reversal of 1685953 is 3595861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1656369 + 29584 = 1287^2 + 172^2 .

It is an emirp because it is prime and its reverse (3595861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1685953 - 2¹ = 1685951 is a prime.

Together with 1685951, it forms a pair of twin primes.

1685953 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1685951) 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, 842976 + 842977.

It is an arithmetic number, because the mean of its divisors is an integer number (842977).

2^1685953 is an apocalyptic number.

It is an amenable number.

1685953 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685953 is an equidigital number, since it uses as much as digits as its factorization.

1685953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 37.

The square root of 1685953 is about 1298.4425285703. The cubic root of 1685953 is about 119.0186868943.

The spelling of 1685953 in words is "one million, six hundred eighty-five thousand, nine hundred fifty-three".