1685736 has 48 divisors (see below), whose sum is σ = 4919460. Its totient is φ = 518400.

The previous prime is 1685731. The next prime is 1685759. The reversal of 1685736 is 6375861.

It can be written as a sum of positive squares in 2 ways, for example, as 1425636 + 260100 = 1194^2 + 510^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1685736.

It is not an unprimeable number, because it can be changed into a prime (1685731) 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 in 11 ways as a sum of consecutive naturals, for example, 36 + ... + 1836.

2^1685736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1685736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2459730).

1685736 is an abundant number, since it is smaller than the sum of its proper divisors (3233724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1685736 is a wasteful number, since it uses less digits than its factorization.

1685736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1826 (or 1819 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 1685736 is about 1298.3589642314. The cubic root of 1685736 is about 119.0135803535.

The spelling of 1685736 in words is "one million, six hundred eighty-five thousand, seven hundred thirty-six".