1684428 has 48 divisors (see below), whose sum is σ = 4354560. Its totient is φ = 504064.

The previous prime is 1684427. The next prime is 1684477. The reversal of 1684428 is 8244861.

It is not an unprimeable number, because it can be changed into a prime (1684427) 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, 4513 + ... + 4871.

It is an arithmetic number, because the mean of its divisors is an integer number (90720).

2^1684428 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 1684428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2177280).

1684428 is an abundant number, since it is smaller than the sum of its proper divisors (2670132).

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

1684428 is a wasteful number, since it uses less digits than its factorization.

1684428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406 (or 404 counting only the distinct ones).

The product of its digits is 12288, while the sum is 33.

The square root of 1684428 is about 1297.8551537055. The cubic root of 1684428 is about 118.9827906286.

It can be divided in two parts, 1684 and 428, that added together give a palindrome (2112).

The spelling of 1684428 in words is "one million, six hundred eighty-four thousand, four hundred twenty-eight".