219985385 has 4 divisors (see below), whose sum is σ = 263982468. Its totient is φ = 175988304.

The previous prime is 219985327. The next prime is 219985391. The reversal of 219985385 is 583589912.

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

It can be written as a sum of positive squares in 2 ways, for example, as 36626704 + 183358681 = 6052^2 + 13541^2 .

It is a cyclic number.

It is not a de Polignac number, because 219985385 - 2¹⁸ = 219723241 is a prime.

It is a super-2 number, since 2×219985385² = 96787139227196450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21998534 + ... + 21998543.

It is an arithmetic number, because the mean of its divisors is an integer number (65995617).

Almost surely, 2^219985385 is an apocalyptic number.

It is an amenable number.

219985385 is a deficient number, since it is larger than the sum of its proper divisors (43997083).

219985385 is an equidigital number, since it uses as much as digits as its factorization.

219985385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43997082.

The product of its digits is 777600, while the sum is 50.

The square root of 219985385 is about 14831.9042944593. The cubic root of 219985385 is about 603.6677055066.

The spelling of 219985385 in words is "two hundred nineteen million, nine hundred eighty-five thousand, three hundred eighty-five".