1686434 has 16 divisors (see below), whose sum is σ = 2702808. Its totient is φ = 786432.

The previous prime is 1686409. The next prime is 1686439. The reversal of 1686434 is 4346861.

It can be written as a sum of positive squares in 4 ways, for example, as 1682209 + 4225 = 1297^2 + 65^2 .

It is an Ulam number.

It is a d-powerful number, because it can be written as 1 + 6³ + 8 + 6⁸ + 4² + 3⁸ + 4² .

It is a self number, because there is not a number n which added to its sum of digits gives 1686434.

It is not an unprimeable number, because it can be changed into a prime (1686439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6434 + ... + 6690.

2^1686434 is an apocalyptic number.

1686434 is a deficient number, since it is larger than the sum of its proper divisors (1016374).

1686434 is a wasteful number, since it uses less digits than its factorization.

1686434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469.

The product of its digits is 13824, while the sum is 32.

The square root of 1686434 is about 1298.6277372673. The cubic root of 1686434 is about 119.0300044389.

The spelling of 1686434 in words is "one million, six hundred eighty-six thousand, four hundred thirty-four".