198045405 has 20 divisors (see below), whose sum is σ = 355015452. Its totient is φ = 105624000.

The previous prime is 198045403. The next prime is 198045443. The reversal of 198045405 is 504540891.

It can be written as a sum of positive squares in 2 ways, for example, as 153809604 + 44235801 = 12402^2 + 6651^2 .

It is not a de Polignac number, because 198045405 - 2¹ = 198045403 is a prime.

It is a super-2 number, since 2×198045405² = 78443964883228050, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 198045405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198045403) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 244096 + ... + 244905.

Almost surely, 2^198045405 is an apocalyptic number.

198045405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

198045405 is a deficient number, since it is larger than the sum of its proper divisors (156970047).

198045405 is an equidigital number, since it uses as much as digits as its factorization.

198045405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489018 (or 489009 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 198045405 is about 14072.8605834066. The cubic root of 198045405 is about 582.8922174425.

The spelling of 198045405 in words is "one hundred ninety-eight million, forty-five thousand, four hundred five".