609998 has 16 divisors (see below), whose sum is σ = 964656. Its totient is φ = 288960.

The previous prime is 609997. The next prime is 610031. The reversal of 609998 is 899906.

It is a Harshad number since it is a multiple of its sum of digits (41).

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 609998.

It is not an unprimeable number, because it can be changed into a prime (609991) 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 7 ways as a sum of consecutive naturals, for example, 3440 + ... + 3612.

It is an arithmetic number, because the mean of its divisors is an integer number (60291).

2⁶⁰⁹⁹⁹⁸ is an apocalyptic number.

609998 is a deficient number, since it is larger than the sum of its proper divisors (354658).

609998 is a wasteful number, since it uses less digits than its factorization.

609998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 609998 is about 781.0236872208. The cubic root of 609998 is about 84.8091681971.

609998 divided by its sum of digits (41) gives a triangular number (14878 = T₁₇₂).

The spelling of 609998 in words is "six hundred nine thousand, nine hundred ninety-eight".