219839930 has 16 divisors (see below), whose sum is σ = 395958024. Its totient is φ = 87881280.

The previous prime is 219839891. The next prime is 219839947. The reversal of 219839930 is 39938912.

It is a Cunningham number, because it is equal to 14827²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 86136961 + 133702969 = 9281^2 + 11563^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12704 + ... + 24516.

Almost surely, 2^219839930 is an apocalyptic number.

219839930 is a deficient number, since it is larger than the sum of its proper divisors (176118094).

219839930 is a wasteful number, since it uses less digits than its factorization.

219839930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13681.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 219839930 is about 14827.0000337223. Note that the first 4 decimals coincide. The cubic root of 219839930 is about 603.5346272026.

It can be divided in two parts, 21983 and 9930, that added together give a palindrome (31913).

The spelling of 219839930 in words is "two hundred nineteen million, eight hundred thirty-nine thousand, nine hundred thirty".