1684439 has 6 divisors (see below), whose sum is σ = 1726416. Its totient is φ = 1643460.

The previous prime is 1684427. The next prime is 1684477. The reversal of 1684439 is 9344861.

It is a de Polignac number, because none of the positive numbers 2^k-1684439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1684399 and 1684408.

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 5 ways as a sum of consecutive naturals, for example, 1394 + ... + 2304.

It is an arithmetic number, because the mean of its divisors is an integer number (287736).

2^1684439 is an apocalyptic number.

1684439 is a deficient number, since it is larger than the sum of its proper divisors (41977).

1684439 is an frugal number, since it uses more digits than its factorization.

1684439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997 (or 954 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 1684439 is about 1297.8593914596. The cubic root of 1684439 is about 118.9830496300.

The spelling of 1684439 in words is "one million, six hundred eighty-four thousand, four hundred thirty-nine".