1684431 has 12 divisors (see below), whose sum is σ = 2780752. Its totient is φ = 962496.

The previous prime is 1684427. The next prime is 1684477. The reversal of 1684431 is 1344861.

It is not a de Polignac number, because 1684431 - 2² = 1684427 is a prime.

It is a super-2 number, since 2×1684431² = 5674615587522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1684395 and 1684404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1684481) 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, 13306 + ... + 13431.

2^1684431 is an apocalyptic number.

1684431 is a deficient number, since it is larger than the sum of its proper divisors (1096321).

1684431 is a wasteful number, since it uses less digits than its factorization.

1684431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26750 (or 26747 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 1684431 is about 1297.8563094580. The cubic root of 1684431 is about 118.9828612655.

The spelling of 1684431 in words is "one million, six hundred eighty-four thousand, four hundred thirty-one".