213630172 has 48 divisors (see below), whose sum is σ = 439729920. Its totient is φ = 88905600.

The previous prime is 213630169. The next prime is 213630173. The reversal of 213630172 is 271036312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213630173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 434847 + ... + 435337.

It is an arithmetic number, because the mean of its divisors is an integer number (9161040).

Almost surely, 2^213630172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213630172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219864960).

213630172 is an abundant number, since it is smaller than the sum of its proper divisors (226099748).

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

213630172 is a wasteful number, since it uses less digits than its factorization.

213630172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922 (or 920 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 213630172 is about 14616.0929115821. The cubic root of 213630172 is about 597.7976407286.

Adding to 213630172 its reverse (271036312), we get a palindrome (484666484).

The spelling of 213630172 in words is "two hundred thirteen million, six hundred thirty thousand, one hundred seventy-two".