998870 has 16 divisors (see below), whose sum is σ = 1829520. Its totient is φ = 392544.

The previous prime is 998861. The next prime is 998897. The reversal of 998870 is 78899.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

998870 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257 + ... + 1436.

It is an arithmetic number, because the mean of its divisors is an integer number (114345).

2⁹⁹⁸⁸⁷⁰ is an apocalyptic number.

998870 is a deficient number, since it is larger than the sum of its proper divisors (830650).

998870 is a wasteful number, since it uses less digits than its factorization.

998870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759.

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

The square root of 998870 is about 999.4348402973. The cubic root of 998870 is about 99.9623191366.

The spelling of 998870 in words is "nine hundred ninety-eight thousand, eight hundred seventy".