213173856 has 240 divisors, whose sum is σ = 741565440. Its totient is φ = 58786560.

The previous prime is 213173843. The next prime is 213173869. The reversal of 213173856 is 658371312.

It is an interprime number because it is at equal distance from previous prime (213173843) and next prime (213173869).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 213173856.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 562275 + ... + 562653.

It is an arithmetic number, because the mean of its divisors is an integer number (3089856).

Almost surely, 2^213173856 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 213173856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (370782720).

213173856 is an abundant number, since it is smaller than the sum of its proper divisors (528391584).

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

213173856 is a wasteful number, since it uses less digits than its factorization.

213173856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439 (or 422 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 213173856 is about 14600.4745128369. The cubic root of 213173856 is about 597.3717035744.

The spelling of 213173856 in words is "two hundred thirteen million, one hundred seventy-three thousand, eight hundred fifty-six".