199042397 has 4 divisors (see below), whose sum is σ = 200263680. Its totient is φ = 197821116.

The previous prime is 199042379. The next prime is 199042411. The reversal of 199042397 is 793240991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 199042397 - 2¹⁰ = 199041373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199042357) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 610397 + ... + 610722.

It is an arithmetic number, because the mean of its divisors is an integer number (50065920).

Almost surely, 2^199042397 is an apocalyptic number.

It is an amenable number.

199042397 is a deficient number, since it is larger than the sum of its proper divisors (1221283).

199042397 is a wasteful number, since it uses less digits than its factorization.

199042397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221282.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 199042397 is about 14108.2386214580. The cubic root of 199042397 is about 583.8687046511.

The spelling of 199042397 in words is "one hundred ninety-nine million, forty-two thousand, three hundred ninety-seven".