198979691400 has 480 divisors, whose sum is σ = 804738939840. Its totient is φ = 44621591040.

The previous prime is 198979691387. The next prime is 198979691429. The reversal of 198979691400 is 4196979891.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 5993647 + ... + 6026753.

It is an arithmetic number, because the mean of its divisors is an integer number (1676539458).

Almost surely, 2^198979691400 is an apocalyptic number.

198979691400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 198979691400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (402369469920).

198979691400 is an abundant number, since it is smaller than the sum of its proper divisors (605759248440).

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

198979691400 is a wasteful number, since it uses less digits than its factorization.

198979691400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33195 (or 33177 counting only the distinct ones).

The product of its (nonzero) digits is 8817984, while the sum is 63.

The spelling of 198979691400 in words is "one hundred ninety-eight billion, nine hundred seventy-nine million, six hundred ninety-one thousand, four hundred".