199609947 has 12 divisors (see below), whose sum is σ = 295827240. Its totient is φ = 133024356.

The previous prime is 199609933. The next prime is 199609973. The reversal of 199609947 is 749906991.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 199609947 - 2¹⁰ = 199608923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 199609893 and 199609902.

It is not an unprimeable number, because it can be changed into a prime (199609997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72054 + ... + 74772.

It is an arithmetic number, because the mean of its divisors is an integer number (24652270).

Almost surely, 2^199609947 is an apocalyptic number.

199609947 is a deficient number, since it is larger than the sum of its proper divisors (96217293).

199609947 is an frugal number, since it uses more digits than its factorization.

199609947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5447 (or 2722 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 54.

The square root of 199609947 is about 14128.3384373393. The cubic root of 199609947 is about 584.4231262642.

The spelling of 199609947 in words is "one hundred ninety-nine million, six hundred nine thousand, nine hundred forty-seven".