216002385 has 12 divisors (see below), whose sum is σ = 374404212. Its totient is φ = 115201248.

The previous prime is 216002383. The next prime is 216002387. The reversal of 216002385 is 583200612.

216002385 is a `hidden beast` number, since 21 + 600 + 2 + 38 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (216002383) and next prime (216002387).

It can be written as a sum of positive squares in 2 ways, for example, as 77422401 + 138579984 = 8799^2 + 11772^2 .

It is not a de Polignac number, because 216002385 - 2¹ = 216002383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216002383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2399982 + ... + 2400071.

It is an arithmetic number, because the mean of its divisors is an integer number (31200351).

Almost surely, 2^216002385 is an apocalyptic number.

It is an amenable number.

216002385 is a deficient number, since it is larger than the sum of its proper divisors (158401827).

216002385 is a wasteful number, since it uses less digits than its factorization.

216002385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4800064 (or 4800061 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 216002385 is about 14697.0195958228. The cubic root of 216002385 is about 600.0022083252.

Adding to 216002385 its reverse (583200612), we get a palindrome (799202997).

The spelling of 216002385 in words is "two hundred sixteen million, two thousand, three hundred eighty-five".