1685457 has 6 divisors (see below), whose sum is σ = 2434562. Its totient is φ = 1123632.

The previous prime is 1685449. The next prime is 1685459. The reversal of 1685457 is 7545861.

It can be written as a sum of positive squares in only one way, i.e., 938961 + 746496 = 969^2 + 864^2 .

It is not a de Polignac number, because 1685457 - 2³ = 1685449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1685459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 93628 + ... + 93645.

2^1685457 is an apocalyptic number.

It is an amenable number.

1685457 is a deficient number, since it is larger than the sum of its proper divisors (749105).

1685457 is a wasteful number, since it uses less digits than its factorization.

1685457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187279 (or 187276 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 1685457 is about 1298.2515164636. The cubic root of 1685457 is about 119.0070141571.

It can be divided in two parts, 168 and 5457, that added together give a square (5625 = 75²).

The spelling of 1685457 in words is "one million, six hundred eighty-five thousand, four hundred fifty-seven".