213305986 has 16 divisors (see below), whose sum is σ = 323178336. Its totient is φ = 105584416.

The previous prime is 213305977. The next prime is 213305993. The reversal of 213305986 is 689503312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127125 + ... + 128791.

It is an arithmetic number, because the mean of its divisors is an integer number (20198646).

Almost surely, 2^213305986 is an apocalyptic number.

213305986 is a deficient number, since it is larger than the sum of its proper divisors (109872350).

213305986 is a wasteful number, since it uses less digits than its factorization.

213305986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2273.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 213305986 is about 14604.9986648407. The cubic root of 213305986 is about 597.4950996021.

It can be divided in two parts, 2133059 and 86, that added together give a triangular number (2133145 = T₂₀₆₅).

The spelling of 213305986 in words is "two hundred thirteen million, three hundred five thousand, nine hundred eighty-six".