1685489 has 8 divisors (see below), whose sum is σ = 1825320. Its totient is φ = 1547136.

The previous prime is 1685483. The next prime is 1685503. The reversal of 1685489 is 9845861.

1685489 = 242² + 243² + ... + 267².

It can be written as a sum of positive squares in 4 ways, for example, as 47089 + 1638400 = 217^2 + 1280^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1685489 - 2⁴ = 1685473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1685483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3917 + ... + 4325.

It is an arithmetic number, because the mean of its divisors is an integer number (228165).

2^1685489 is an apocalyptic number.

It is an amenable number.

1685489 is a deficient number, since it is larger than the sum of its proper divisors (139831).

1685489 is a wasteful number, since it uses less digits than its factorization.

1685489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739.

The product of its digits is 69120, while the sum is 41.

The square root of 1685489 is about 1298.2638406734. The cubic root of 1685489 is about 119.0077673060.

The spelling of 1685489 in words is "one million, six hundred eighty-five thousand, four hundred eighty-nine".