698638 has 8 divisors (see below), whose sum is σ = 1052640. Its totient is φ = 347760.

The previous prime is 698591. The next prime is 698641. The reversal of 698638 is 836896.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 698638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103 + ... + 1186.

It is an arithmetic number, because the mean of its divisors is an integer number (131580).

2⁶⁹⁸⁶³⁸ is an apocalyptic number.

698638 is a deficient number, since it is larger than the sum of its proper divisors (354002).

698638 is a wasteful number, since it uses less digits than its factorization.

698638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562.

The product of its digits is 62208, while the sum is 40.

The square root of 698638 is about 835.8456795366. The cubic root of 698638 is about 88.7327758679.

The spelling of 698638 in words is "six hundred ninety-eight thousand, six hundred thirty-eight".