998787 has 6 divisors (see below), whose sum is σ = 1334028. Its totient is φ = 664704.

The previous prime is 998779. The next prime is 998813. The reversal of 998787 is 787899.

It is not a de Polignac number, because 998787 - 2³ = 998779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (998717) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1443 + ... + 2019.

It is an arithmetic number, because the mean of its divisors is an integer number (222338).

2⁹⁹⁸⁷⁸⁷ is an apocalyptic number.

998787 is a deficient number, since it is larger than the sum of its proper divisors (335241).

998787 is an frugal number, since it uses more digits than its factorization.

998787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157 (or 580 counting only the distinct ones).

The product of its digits is 254016, while the sum is 48.

The square root of 998787 is about 999.3933159672. The cubic root of 998787 is about 99.9595503071.

Multiplying 998787 by its sum of digits (48), we get a square (47941776 = 6924²).

The spelling of 998787 in words is "nine hundred ninety-eight thousand, seven hundred eighty-seven".