998458440 has 128 divisors (see below), whose sum is σ = 3430944000. Its totient is φ = 227708928.

The previous prime is 998458367. The next prime is 998458441. The reversal of 998458440 is 44854899.

It is not an unprimeable number, because it can be changed into a prime (998458441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 476916 + ... + 479004.

It is an arithmetic number, because the mean of its divisors is an integer number (26804250).

Almost surely, 2^998458440 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 998458440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1715472000).

998458440 is an abundant number, since it is smaller than the sum of its proper divisors (2432485560).

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

998458440 is a wasteful number, since it uses less digits than its factorization.

998458440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679 (or 2675 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 51.

The square root of 998458440 is about 31598.3929971130. The cubic root of 998458440 is about 999.4858823951.

The spelling of 998458440 in words is "nine hundred ninety-eight million, four hundred fifty-eight thousand, four hundred forty".