698639 has 4 divisors (see below), whose sum is σ = 722760. Its totient is φ = 674520.

The previous prime is 698591. The next prime is 698641. The reversal of 698639 is 936896.

698639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-698639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 698596 and 698605.

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 698639.

It is not an unprimeable number, because it can be changed into a prime (698669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12017 + ... + 12074.

It is an arithmetic number, because the mean of its divisors is an integer number (180690).

2⁶⁹⁸⁶³⁹ is an apocalyptic number.

698639 is a deficient number, since it is larger than the sum of its proper divisors (24121).

698639 is a wasteful number, since it uses less digits than its factorization.

698639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24120.

The product of its digits is 69984, while the sum is 41.

The square root of 698639 is about 835.8462777329. The cubic root of 698639 is about 88.7328182040.

The spelling of 698639 in words is "six hundred ninety-eight thousand, six hundred thirty-nine".