198287540 has 36 divisors (see below), whose sum is σ = 457705668. Its totient is φ = 72103680.

The previous prime is 198287539. The next prime is 198287597. The reversal of 198287540 is 45782891.

It can be written as a sum of positive squares in 2 ways, for example, as 118113424 + 80174116 = 10868^2 + 8954^2 .

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 198287491 and 198287500.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38549 + ... + 43388.

Almost surely, 2^198287540 is an apocalyptic number.

198287540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198287540 is an abundant number, since it is smaller than the sum of its proper divisors (259418128).

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

198287540 is a wasteful number, since it uses less digits than its factorization.

198287540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81968 (or 81955 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 44.

The square root of 198287540 is about 14081.4608617146. The cubic root of 198287540 is about 583.1296733032.

The spelling of 198287540 in words is "one hundred ninety-eight million, two hundred eighty-seven thousand, five hundred forty".