198396557 has 4 divisors (see below), whose sum is σ = 198560796. Its totient is φ = 198232320.

The previous prime is 198396521. The next prime is 198396593. The reversal of 198396557 is 755693891.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (198396521) and next prime (198396593).

It can be written as a sum of positive squares in 2 ways, for example, as 18541636 + 179854921 = 4306^2 + 13411^2 .

It is a cyclic number.

It is not a de Polignac number, because 198396557 - 2¹⁴ = 198380173 is a prime.

It is a super-2 number, since 2×198396557² = 78722387658908498, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 198396499 and 198396508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198386557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80294 + ... + 82727.

It is an arithmetic number, because the mean of its divisors is an integer number (49640199).

Almost surely, 2^198396557 is an apocalyptic number.

It is an amenable number.

198396557 is a deficient number, since it is larger than the sum of its proper divisors (164239).

198396557 is a wasteful number, since it uses less digits than its factorization.

198396557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164238.

The product of its digits is 2041200, while the sum is 53.

The square root of 198396557 is about 14085.3312705098. The cubic root of 198396557 is about 583.2365204957.

The spelling of 198396557 in words is "one hundred ninety-eight million, three hundred ninety-six thousand, five hundred fifty-seven".