998729 has 8 divisors (see below), whose sum is σ = 1052352. Its totient is φ = 946000.

The previous prime is 998717. The next prime is 998737. The reversal of 998729 is 927899.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-998729 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 998729.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3854 + ... + 4104.

It is an arithmetic number, because the mean of its divisors is an integer number (131544).

2⁹⁹⁸⁷²⁹ is an apocalyptic number.

It is an amenable number.

998729 is a deficient number, since it is larger than the sum of its proper divisors (53623).

998729 is a wasteful number, since it uses less digits than its factorization.

998729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447.

The product of its digits is 81648, while the sum is 44.

The square root of 998729 is about 999.3642979414. The cubic root of 998729 is about 99.9576153713.

The spelling of 998729 in words is "nine hundred ninety-eight thousand, seven hundred twenty-nine".