1688434 has 12 divisors (see below), whose sum is σ = 2784222. Its totient is φ = 767360.

The previous prime is 1688413. The next prime is 1688443. The reversal of 1688434 is 4348861.

It can be written as a sum of positive squares in only one way, i.e., 1600225 + 88209 = 1265^2 + 297^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1688434.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3247 + ... + 3730.

2^1688434 is an apocalyptic number.

1688434 is a deficient number, since it is larger than the sum of its proper divisors (1095788).

1688434 is a wasteful number, since it uses less digits than its factorization.

1688434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7001 (or 6990 counting only the distinct ones).

The product of its digits is 18432, while the sum is 34.

The square root of 1688434 is about 1299.3975527143. The cubic root of 1688434 is about 119.0770397736.

It can be divided in two parts, 16884 and 34, that multiplied together give a triangular number (574056 = T₁₀₇₁).

The spelling of 1688434 in words is "one million, six hundred eighty-eight thousand, four hundred thirty-four".