617998 has 4 divisors (see below), whose sum is σ = 927000. Its totient is φ = 308998.

The previous prime is 617983. The next prime is 618029. The reversal of 617998 is 899716.

617998 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 Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 617998.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154498 + ... + 154501.

It is an arithmetic number, because the mean of its divisors is an integer number (231750).

2⁶¹⁷⁹⁹⁸ is an apocalyptic number.

617998 is a deficient number, since it is larger than the sum of its proper divisors (309002).

617998 is a wasteful number, since it uses less digits than its factorization.

617998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309001.

The product of its digits is 27216, while the sum is 40.

The square root of 617998 is about 786.1284882257. The cubic root of 617998 is about 85.1783108037.

The spelling of 617998 in words is "six hundred seventeen thousand, nine hundred ninety-eight".