1685424 has 80 divisors (see below), whose sum is σ = 4881632. Its totient is φ = 497664.

The previous prime is 1685423. The next prime is 1685429. The reversal of 1685424 is 4245861.

Its product of digits (7680) is a multiple of the sum of its prime divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 1685391 and 1685400.

It is not an unprimeable number, because it can be changed into a prime (1685423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23052 + ... + 23124.

2^1685424 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 1685424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2440816).

1685424 is an abundant number, since it is smaller than the sum of its proper divisors (3196208).

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

1685424 is a wasteful number, since it uses less digits than its factorization.

1685424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 128 counting only the distinct ones).

The product of its digits is 7680, while the sum is 30.

The square root of 1685424 is about 1298.2388069997. The cubic root of 1685424 is about 119.0062374623.

It can be divided in two parts, 16854 and 24, that multiplied together give a square (404496 = 636²).

The spelling of 1685424 in words is "one million, six hundred eighty-five thousand, four hundred twenty-four".