698989 has 4 divisors (see below), whose sum is σ = 740124. Its totient is φ = 657856.

The previous prime is 698983. The next prime is 699001. The reversal of 698989 is 989896.

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 514089 + 184900 = 717^2 + 430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-698989 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 not an unprimeable number, because it can be changed into a prime (698983) 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, 20542 + ... + 20575.

It is an arithmetic number, because the mean of its divisors is an integer number (185031).

2⁶⁹⁸⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

698989 is a deficient number, since it is larger than the sum of its proper divisors (41135).

698989 is a wasteful number, since it uses less digits than its factorization.

698989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41134.

The product of its digits is 279936, while the sum is 49.

The square root of 698989 is about 836.0556201593. The cubic root of 698989 is about 88.7476333430.

The spelling of 698989 in words is "six hundred ninety-eight thousand, nine hundred eighty-nine".