219808947 has 4 divisors (see below), whose sum is σ = 293078600. Its totient is φ = 146539296.

The previous prime is 219808931. The next prime is 219808973. The reversal of 219808947 is 749808912.

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

It is not a de Polignac number, because 219808947 - 2⁴ = 219808931 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 219808896 and 219808905.

It is not an unprimeable number, because it can be changed into a prime (219808247) 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, 36634822 + ... + 36634827.

It is an arithmetic number, because the mean of its divisors is an integer number (73269650).

Almost surely, 2^219808947 is an apocalyptic number.

219808947 is a deficient number, since it is larger than the sum of its proper divisors (73269653).

219808947 is an equidigital number, since it uses as much as digits as its factorization.

219808947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73269652.

The product of its (nonzero) digits is 290304, while the sum is 48.

The square root of 219808947 is about 14825.9551800213. The cubic root of 219808947 is about 603.5062729482.

The spelling of 219808947 in words is "two hundred nineteen million, eight hundred eight thousand, nine hundred forty-seven".