1684404 has 36 divisors (see below), whose sum is σ = 4324320. Its totient is φ = 552720.

The previous prime is 1684399. The next prime is 1684409. The reversal of 1684404 is 4044861.

It is an interprime number because it is at equal distance from previous prime (1684399) and next prime (1684409).

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1684409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2227 + ... + 2885.

It is an arithmetic number, because the mean of its divisors is an integer number (120120).

2^1684404 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 1684404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2162160).

1684404 is an abundant number, since it is smaller than the sum of its proper divisors (2639916).

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

1684404 is a wasteful number, since it uses less digits than its factorization.

1684404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740 (or 735 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 1684404 is about 1297.8459076485. The cubic root of 1684404 is about 118.9822255306.

The spelling of 1684404 in words is "one million, six hundred eighty-four thousand, four hundred four".