213871766 has 16 divisors (see below), whose sum is σ = 337145424. Its totient is φ = 101624544.

The previous prime is 213871753. The next prime is 213871783. The reversal of 213871766 is 667178312.

It is a super-2 number, since 2×213871766² = 91482264583917512, which contains 22 as substring.

It is a congruent number.

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, 30425 + ... + 36788.

It is an arithmetic number, because the mean of its divisors is an integer number (21071589).

Almost surely, 2^213871766 is an apocalyptic number.

213871766 is a deficient number, since it is larger than the sum of its proper divisors (123273658).

213871766 is a wasteful number, since it uses less digits than its factorization.

213871766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67295.

The product of its digits is 84672, while the sum is 41.

The square root of 213871766 is about 14624.3552336505. The cubic root of 213871766 is about 598.0229052795.

The spelling of 213871766 in words is "two hundred thirteen million, eight hundred seventy-one thousand, seven hundred sixty-six".