198450 has 90 divisors (see below), whose sum is σ = 641421. Its totient is φ = 45360.
The previous prime is 198439. The next prime is 198461. The reversal of 198450 is 54891.
198450 = T6 + T7 + ... + T105.
It is an interprime number because it is at equal distance from previous prime (198439) and next prime (198461).
It can be written as a sum of positive squares in 2 ways, for example, as 194481 + 3969 = 441^2 + 63^2 .
It is a tau number, because it is divible by the number of its divisors (90).
It is an ABA number since it can be written as A⋅BA, here for A=2, B=315.
It is a Harshad number since it is a multiple of its sum of digits (27).
It is an Ulam number.
It is a nialpdrome in base 9.
It is a zygodrome in base 9.
It is an unprimeable number.
It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 28347 + ... + 28353.
198450 is a Friedman number, since it can be written as 810*49*5, using all its digits and the basic arithmetic operations.
2198450 is an apocalyptic number.
198450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is a practical number, because each smaller number is the sum of distinct divisors of 198450
198450 is an abundant number, since it is smaller than the sum of its proper divisors (442971).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
198450 is a wasteful number, since it uses less digits than its factorization.
198450 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 38 (or 17 counting only the distinct ones).
The product of its (nonzero) digits is 1440, while the sum is 27.
The square root of 198450 is about 445.4772721475. The cubic root of 198450 is about 58.3288885502.
The spelling of 198450 in words is "one hundred ninety-eight thousand, four hundred fifty".
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