1685745 has 16 divisors (see below), whose sum is σ = 2997120. Its totient is φ = 898992.

The previous prime is 1685731. The next prime is 1685759. The reversal of 1685745 is 5475861.

It is an interprime number because it is at equal distance from previous prime (1685731) and next prime (1685759).

It is not a de Polignac number, because 1685745 - 2⁵ = 1685713 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6109 + ... + 6378.

It is an arithmetic number, because the mean of its divisors is an integer number (187320).

2^1685745 is an apocalyptic number.

1685745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1685745 is a deficient number, since it is larger than the sum of its proper divisors (1311375).

1685745 is a wasteful number, since it uses less digits than its factorization.

1685745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12501 (or 12495 counting only the distinct ones).

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

The square root of 1685745 is about 1298.3624301404. The cubic root of 1685745 is about 119.0137921542.

The spelling of 1685745 in words is "one million, six hundred eighty-five thousand, seven hundred forty-five".