198522738 has 66 divisors (see below), whose sum is σ = 457833837. Its totient is φ = 64560240.

The previous prime is 198522713. The next prime is 198522749. The reversal of 198522738 is 837225891.

It is a happy number.

198522738 is a `hidden beast` number, since 1 + 98 + 522 + 7 + 38 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 141776649 + 56746089 = 11907^2 + 7533^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=9963.

It is a super-2 number, since 2×198522738² = 78822555006033288, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 198522693 and 198522702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 32 ways as a sum of consecutive naturals, for example, 4841998 + ... + 4842038.

Almost surely, 2^198522738 is an apocalyptic number.

198522738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 198522738

198522738 is an abundant number, since it is smaller than the sum of its proper divisors (259311099).

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

198522738 is an frugal number, since it uses more digits than its factorization.

198522738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114 (or 46 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 198522738 is about 14089.8097219231. The cubic root of 198522738 is about 583.3601412079.

The spelling of 198522738 in words is "one hundred ninety-eight million, five hundred twenty-two thousand, seven hundred thirty-eight".