213704238 has 64 divisors (see below), whose sum is σ = 480598272. Its totient is φ = 62791680.

The previous prime is 213704237. The next prime is 213704251. The reversal of 213704238 is 832407312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213704237) 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 31 ways as a sum of consecutive naturals, for example, 729220 + ... + 729512.

It is an arithmetic number, because the mean of its divisors is an integer number (7509348).

Almost surely, 2^213704238 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213704238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240299136).

213704238 is an abundant number, since it is smaller than the sum of its proper divisors (266894034).

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

213704238 is a wasteful number, since it uses less digits than its factorization.

213704238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 213704238 is about 14618.6264060615. The cubic root of 213704238 is about 597.8667186179.

The spelling of 213704238 in words is "two hundred thirteen million, seven hundred four thousand, two hundred thirty-eight".