213864239 has 4 divisors (see below), whose sum is σ = 213895440. Its totient is φ = 213833040.

The previous prime is 213864223. The next prime is 213864253. The reversal of 213864239 is 932468312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 213864239 - 2⁴ = 213864223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213864289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347 + ... + 20684.

It is an arithmetic number, because the mean of its divisors is an integer number (53473860).

Almost surely, 2^213864239 is an apocalyptic number.

213864239 is a deficient number, since it is larger than the sum of its proper divisors (31201).

213864239 is a wasteful number, since it uses less digits than its factorization.

213864239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31200.

The product of its digits is 62208, while the sum is 38.

The square root of 213864239 is about 14624.0978867074. The cubic root of 213864239 is about 598.0158895939.

The spelling of 213864239 in words is "two hundred thirteen million, eight hundred sixty-four thousand, two hundred thirty-nine".