199289747 has 4 divisors (see below), whose sum is σ = 201152376. Its totient is φ = 197427120.

The previous prime is 199289743. The next prime is 199289767. The reversal of 199289747 is 747982991.

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

It is a cyclic number.

It is not a de Polignac number, because 199289747 - 2² = 199289743 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199289692 and 199289701.

It is not an unprimeable number, because it can be changed into a prime (199289743) 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, 931154 + ... + 931367.

It is an arithmetic number, because the mean of its divisors is an integer number (50288094).

Almost surely, 2^199289747 is an apocalyptic number.

199289747 is a deficient number, since it is larger than the sum of its proper divisors (1862629).

199289747 is a wasteful number, since it uses less digits than its factorization.

199289747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1862628.

The product of its digits is 2286144, while the sum is 56.

The square root of 199289747 is about 14117.0020542607. The cubic root of 199289747 is about 584.1104624273.

The spelling of 199289747 in words is "one hundred ninety-nine million, two hundred eighty-nine thousand, seven hundred forty-seven".