998689440 has 192 divisors, whose sum is σ = 3751888896. Its totient is φ = 218330112.

The previous prime is 998689409. The next prime is 998689453. The reversal of 998689440 is 44986899.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 70819 + ... + 83741.

It is an arithmetic number, because the mean of its divisors is an integer number (19541088).

Almost surely, 2^998689440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 998689440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1875944448).

998689440 is an abundant number, since it is smaller than the sum of its proper divisors (2753199456).

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

998689440 is a wasteful number, since it uses less digits than its factorization.

998689440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12971 (or 12963 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 57.

The square root of 998689440 is about 31602.0480348980. The cubic root of 998689440 is about 999.5629556868.

The spelling of 998689440 in words is "nine hundred ninety-eight million, six hundred eighty-nine thousand, four hundred forty".