998831574 has 72 divisors (see below), whose sum is σ = 2430405432. Its totient is φ = 307307520.

The previous prime is 998831551. The next prime is 998831597. The reversal of 998831574 is 475138899.

It is an interprime number because it is at equal distance from previous prime (998831551) and next prime (998831597).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 998831574.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 76054 + ... + 88214.

It is an arithmetic number, because the mean of its divisors is an integer number (33755631).

Almost surely, 2^998831574 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998831574, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1215202716).

998831574 is an abundant number, since it is smaller than the sum of its proper divisors (1431573858).

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

998831574 is a wasteful number, since it uses less digits than its factorization.

998831574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12204 (or 12179 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 998831574 is about 31604.2967648388. The cubic root of 998831574 is about 999.6103728771.

The spelling of 998831574 in words is "nine hundred ninety-eight million, eight hundred thirty-one thousand, five hundred seventy-four".