219889939 has 2 divisors, whose sum is σ = 219889940. Its totient is φ = 219889938.

The previous prime is 219889937. The next prime is 219889987. The reversal of 219889939 is 939988912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 219889939 - 2¹ = 219889937 is a prime.

Together with 219889937, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (219889937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109944969 + 109944970.

It is an arithmetic number, because the mean of its divisors is an integer number (109944970).

Almost surely, 2^219889939 is an apocalyptic number.

219889939 is a deficient number, since it is larger than the sum of its proper divisors (1).

219889939 is an equidigital number, since it uses as much as digits as its factorization.

219889939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 58.

The square root of 219889939 is about 14828.6863544955. The cubic root of 219889939 is about 603.5803875805.

The spelling of 219889939 in words is "two hundred nineteen million, eight hundred eighty-nine thousand, nine hundred thirty-nine".