213187684 has 12 divisors (see below), whose sum is σ = 395024364. Its totient is φ = 100323584.

The previous prime is 213187609. The next prime is 213187717. The reversal of 213187684 is 486781312.

It can be written as a sum of positive squares in 2 ways, for example, as 128142400 + 85045284 = 11320^2 + 9222^2 .

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, 1567489 + ... + 1567624.

It is an arithmetic number, because the mean of its divisors is an integer number (32918697).

Almost surely, 2^213187684 is an apocalyptic number.

It is an amenable number.

213187684 is a deficient number, since it is larger than the sum of its proper divisors (181836680).

213187684 is a wasteful number, since it uses less digits than its factorization.

213187684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3135134 (or 3135132 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The square root of 213187684 is about 14600.9480514109. The cubic root of 213187684 is about 597.3846199133.

The spelling of 213187684 in words is "two hundred thirteen million, one hundred eighty-seven thousand, six hundred eighty-four".