687193 has 4 divisors (see below), whose sum is σ = 740068. Its totient is φ = 634320.

The previous prime is 687179. The next prime is 687223. The reversal of 687193 is 391786.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 391786 = 2 ⋅195893.

It can be written as a sum of positive squares in 2 ways, for example, as 267289 + 419904 = 517^2 + 648^2 .

It is a cyclic number.

It is not a de Polignac number, because 687193 - 2⁵ = 687161 is a prime.

It is a Duffinian number.

687193 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (687163) 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 3 ways as a sum of consecutive naturals, for example, 26418 + ... + 26443.

It is an arithmetic number, because the mean of its divisors is an integer number (185017).

2⁶⁸⁷¹⁹³ is an apocalyptic number.

It is an amenable number.

687193 is a deficient number, since it is larger than the sum of its proper divisors (52875).

687193 is a wasteful number, since it uses less digits than its factorization.

687193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52874.

The product of its digits is 9072, while the sum is 34.

The square root of 687193 is about 828.9710489517. The cubic root of 687193 is about 88.2455692522.

The spelling of 687193 in words is "six hundred eighty-seven thousand, one hundred ninety-three".