998780 has 12 divisors (see below), whose sum is σ = 2097480. Its totient is φ = 399504.

The previous prime is 998779. The next prime is 998813. The reversal of 998780 is 87899.

It is a super-3 number, since 3×998780³ = 2989033390152456000, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24950 + ... + 24989.

It is an arithmetic number, because the mean of its divisors is an integer number (174790).

2⁹⁹⁸⁷⁸⁰ is an apocalyptic number.

It is an amenable number.

998780 is an abundant number, since it is smaller than the sum of its proper divisors (1098700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

998780 is a wasteful number, since it uses less digits than its factorization.

998780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49948 (or 49946 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 998780 is about 999.3898138364. The cubic root of 998780 is about 99.9593167843.

It can be divided in two parts, 9 and 98780, that added together give a palindrome (98789).

The spelling of 998780 in words is "nine hundred ninety-eight thousand, seven hundred eighty".