998507 has 4 divisors (see below), whose sum is σ = 1051080. Its totient is φ = 945936.

The previous prime is 998497. The next prime is 998513. The reversal of 998507 is 705899.

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

It is a cyclic number.

It is not a de Polignac number, because 998507 - 2⁶ = 998443 is a prime.

It is not an unprimeable number, because it can be changed into a prime (998527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26258 + ... + 26295.

It is an arithmetic number, because the mean of its divisors is an integer number (262770).

2⁹⁹⁸⁵⁰⁷ is an apocalyptic number.

998507 is a deficient number, since it is larger than the sum of its proper divisors (52573).

998507 is a wasteful number, since it uses less digits than its factorization.

998507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52572.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 998507 is about 999.2532211607. The cubic root of 998507 is about 99.9502085456.

The spelling of 998507 in words is "nine hundred ninety-eight thousand, five hundred seven".