213788530 has 32 divisors (see below), whose sum is σ = 396568368. Its totient is φ = 82944000.

The previous prime is 213788527. The next prime is 213788543. The reversal of 213788530 is 35887312.

It can be written as a sum of positive squares in 8 ways, for example, as 46526041 + 167262489 = 6821^2 + 12933^2 .

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 213788530.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42130 + ... + 46930.

Almost surely, 2^213788530 is an apocalyptic number.

213788530 is a deficient number, since it is larger than the sum of its proper divisors (182779838).

213788530 is a wasteful number, since it uses less digits than its factorization.

213788530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4942.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 213788530 is about 14621.5091560345. The cubic root of 213788530 is about 597.9453144029.

The spelling of 213788530 in words is "two hundred thirteen million, seven hundred eighty-eight thousand, five hundred thirty".