1685408 has 24 divisors (see below), whose sum is σ = 3427200. Its totient is φ = 815040.

The previous prime is 1685407. The next prime is 1685419. The reversal of 1685408 is 8045861.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (1685407) 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 3 ways as a sum of consecutive naturals, for example, 143 + ... + 1841.

It is an arithmetic number, because the mean of its divisors is an integer number (142800).

2^1685408 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 1685408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1713600).

1685408 is an abundant number, since it is smaller than the sum of its proper divisors (1741792).

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

1685408 is a wasteful number, since it uses less digits than its factorization.

1685408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740 (or 1732 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 1685408 is about 1298.2326447906. The cubic root of 1685408 is about 119.0058608793.

The spelling of 1685408 in words is "one million, six hundred eighty-five thousand, four hundred eight".