1688373 has 6 divisors (see below), whose sum is σ = 2438774. Its totient is φ = 1125576.

The previous prime is 1688371. The next prime is 1688387. The reversal of 1688373 is 3738861.

It can be written as a sum of positive squares in only one way, i.e., 1306449 + 381924 = 1143^2 + 618^2 .

It is not a de Polignac number, because 1688373 - 2¹ = 1688371 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1688371) by changing a digit.

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, 93790 + ... + 93807.

2^1688373 is an apocalyptic number.

It is an amenable number.

1688373 is a deficient number, since it is larger than the sum of its proper divisors (750401).

1688373 is a wasteful number, since it uses less digits than its factorization.

1688373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187603 (or 187600 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 1688373 is about 1299.3740800863. The cubic root of 1688373 is about 119.0756057452.

The spelling of 1688373 in words is "one million, six hundred eighty-eight thousand, three hundred seventy-three".