198638516 has 12 divisors (see below), whose sum is σ = 359604420. Its totient is φ = 95894400.

The previous prime is 198638507. The next prime is 198638527. The reversal of 198638516 is 615836891.

It can be written as a sum of positive squares in 2 ways, for example, as 89226916 + 109411600 = 9446^2 + 10460^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 856085 + ... + 856316.

It is an arithmetic number, because the mean of its divisors is an integer number (29967035).

Almost surely, 2^198638516 is an apocalyptic number.

It is an amenable number.

198638516 is a deficient number, since it is larger than the sum of its proper divisors (160965904).

198638516 is a wasteful number, since it uses less digits than its factorization.

198638516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1712434 (or 1712432 counting only the distinct ones).

The product of its digits is 311040, while the sum is 47.

The square root of 198638516 is about 14093.9176952329. The cubic root of 198638516 is about 583.4735239293.

The spelling of 198638516 in words is "one hundred ninety-eight million, six hundred thirty-eight thousand, five hundred sixteen".