213643830 has 32 divisors (see below), whose sum is σ = 515190528. Its totient is φ = 56700000.

The previous prime is 213643819. The next prime is 213643831. The reversal of 213643830 is 38346312.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213643831) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 10546 + ... + 23205.

It is an arithmetic number, because the mean of its divisors is an integer number (16099704).

Almost surely, 2^213643830 is an apocalyptic number.

213643830 is an abundant number, since it is smaller than the sum of its proper divisors (301546698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213643830 is a wasteful number, since it uses less digits than its factorization.

213643830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33972.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 213643830 is about 14616.5601288402. The cubic root of 213643830 is about 597.8103801060.

The spelling of 213643830 in words is "two hundred thirteen million, six hundred forty-three thousand, eight hundred thirty".