905998 has 8 divisors (see below), whose sum is σ = 1438992. Its totient is φ = 426336.

The previous prime is 905963. The next prime is 905999. The reversal of 905998 is 899509.

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

It is a self number, because there is not a number n which added to its sum of digits gives 905998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (905999) 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, 13290 + ... + 13357.

It is an arithmetic number, because the mean of its divisors is an integer number (179874).

2⁹⁰⁵⁹⁹⁸ is an apocalyptic number.

905998 is a deficient number, since it is larger than the sum of its proper divisors (532994).

905998 is a wasteful number, since it uses less digits than its factorization.

905998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26666.

The product of its (nonzero) digits is 29160, while the sum is 40.

The square root of 905998 is about 951.8392721463. The cubic root of 905998 is about 96.7629454286.

The spelling of 905998 in words is "nine hundred five thousand, nine hundred ninety-eight".