213403256 has 64 divisors (see below), whose sum is σ = 454671360. Its totient is φ = 93024000.

The previous prime is 213403249. The next prime is 213403271. The reversal of 213403256 is 652304312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 373451 + ... + 374021.

It is an arithmetic number, because the mean of its divisors is an integer number (7104240).

Almost surely, 2^213403256 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 213403256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227335680).

213403256 is an abundant number, since it is smaller than the sum of its proper divisors (241268104).

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

213403256 is a wasteful number, since it uses less digits than its factorization.

213403256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756 (or 752 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 213403256 is about 14608.3283095637. The cubic root of 213403256 is about 597.5859073621.

Adding to 213403256 its reverse (652304312), we get a palindrome (865707568).

The spelling of 213403256 in words is "two hundred thirteen million, four hundred three thousand, two hundred fifty-six".