998705400 has 192 divisors, whose sum is σ = 3860110080. Its totient is φ = 207513600.

The previous prime is 998705399. The next prime is 998705423. The reversal of 998705400 is 4507899.

998705400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×998705400³ (a number of 28 digits) contains 333 as substring.

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 polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35392 + ... + 57008.

It is an arithmetic number, because the mean of its divisors is an integer number (20104740).

Almost surely, 2^998705400 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 998705400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1930055040).

998705400 is an abundant number, since it is smaller than the sum of its proper divisors (2861404680).

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

998705400 is a wasteful number, since it uses less digits than its factorization.

998705400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21654 (or 21645 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 998705400 is about 31602.3005491689. The cubic root of 998705400 is about 999.5682803116.

The spelling of 998705400 in words is "nine hundred ninety-eight million, seven hundred five thousand, four hundred".