199242405 has 12 divisors (see below), whose sum is σ = 345353580. Its totient is φ = 106262592.

The previous prime is 199242377. The next prime is 199242437. The reversal of 199242405 is 504242991.

199242405 is a `hidden beast` number, since 1 + 9 + 9 + 242 + 405 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 78747876 + 120494529 = 8874^2 + 10977^2 .

It is not a de Polignac number, because 199242405 - 2⁸ = 199242149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199242405.

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, 2213760 + ... + 2213849.

It is an arithmetic number, because the mean of its divisors is an integer number (28779465).

Almost surely, 2^199242405 is an apocalyptic number.

199242405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

199242405 is a deficient number, since it is larger than the sum of its proper divisors (146111175).

199242405 is a wasteful number, since it uses less digits than its factorization.

199242405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4427620 (or 4427617 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 199242405 is about 14115.3251822266. The cubic root of 199242405 is about 584.0642062469.

The spelling of 199242405 in words is "one hundred ninety-nine million, two hundred forty-two thousand, four hundred five".