698605 has 4 divisors (see below), whose sum is σ = 838332. Its totient is φ = 558880.

The previous prime is 698591. The next prime is 698641. The reversal of 698605 is 506896.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 413449 + 285156 = 643^2 + 534^2 .

It is not a de Polignac number, because 698605 - 2¹⁷ = 567533 is a prime.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 69856 + ... + 69865.

It is an arithmetic number, because the mean of its divisors is an integer number (209583).

2⁶⁹⁸⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

698605 is a deficient number, since it is larger than the sum of its proper divisors (139727).

698605 is a wasteful number, since it uses less digits than its factorization.

698605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139726.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 698605 is about 835.8259388174. The cubic root of 698605 is about 88.7313787554.

The spelling of 698605 in words is "six hundred ninety-eight thousand, six hundred five".