998970 has 64 divisors (see below), whose sum is σ = 2820096. Its totient is φ = 221760.

The previous prime is 998969. The next prime is 998983. The reversal of 998970 is 79899.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 14035 + ... + 14105.

It is an arithmetic number, because the mean of its divisors is an integer number (44064).

2⁹⁹⁸⁹⁷⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1410048).

998970 is an abundant number, since it is smaller than the sum of its proper divisors (1821126).

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

998970 is a wasteful number, since it uses less digits than its factorization.

998970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155.

The product of its (nonzero) digits is 40824, while the sum is 42.

The square root of 998970 is about 999.4848673192. The cubic root of 998970 is about 99.9656548721.

The spelling of 998970 in words is "nine hundred ninety-eight thousand, nine hundred seventy".