198737947 has 4 divisors (see below), whose sum is σ = 203585256. Its totient is φ = 193890640.

The previous prime is 198737933. The next prime is 198737951. The reversal of 198737947 is 749737891.

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

It is a de Polignac number, because none of the positive numbers 2^k-198737947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198737927) 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, 2423593 + ... + 2423674.

It is an arithmetic number, because the mean of its divisors is an integer number (50896314).

Almost surely, 2^198737947 is an apocalyptic number.

198737947 is a deficient number, since it is larger than the sum of its proper divisors (4847309).

198737947 is an equidigital number, since it uses as much as digits as its factorization.

198737947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4847308.

The product of its digits is 2667168, while the sum is 55.

The square root of 198737947 is about 14097.4446975330. Note that the first 3 decimals coincide. The cubic root of 198737947 is about 583.5708626860.

The spelling of 198737947 in words is "one hundred ninety-eight million, seven hundred thirty-seven thousand, nine hundred forty-seven".