698309 has 4 divisors (see below), whose sum is σ = 739404. Its totient is φ = 657216.

The previous prime is 698297. The next prime is 698311. The reversal of 698309 is 903896.

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 605284 + 93025 = 778^2 + 305^2 .

It is a cyclic number.

It is not a de Polignac number, because 698309 - 2⁴ = 698293 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 698309.

It is not an unprimeable number, because it can be changed into a prime (698329) 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, 20522 + ... + 20555.

It is an arithmetic number, because the mean of its divisors is an integer number (184851).

2⁶⁹⁸³⁰⁹ is an apocalyptic number.

It is an amenable number.

698309 is a deficient number, since it is larger than the sum of its proper divisors (41095).

698309 is a wasteful number, since it uses less digits than its factorization.

698309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41094.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 698309 is about 835.6488496970. The cubic root of 698309 is about 88.7188451117.

The spelling of 698309 in words is "six hundred ninety-eight thousand, three hundred nine".