213963856 has 30 divisors (see below), whose sum is σ = 429369902. Its totient is φ = 103286400.

The previous prime is 213963847. The next prime is 213963889. The reversal of 213963856 is 658369312.

It can be written as a sum of positive squares in 3 ways, for example, as 103713856 + 110250000 = 10184^2 + 10500^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5506 + ... + 21406.

Almost surely, 2^213963856 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 213963856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214684951).

213963856 is an abundant number, since it is smaller than the sum of its proper divisors (215406046).

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

213963856 is a wasteful number, since it uses less digits than its factorization.

213963856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15967 (or 15932 counting only the distinct ones).

The product of its digits is 233280, while the sum is 43.

The square root of 213963856 is about 14627.5034096732. The cubic root of 213963856 is about 598.1087262178.

It can be divided in two parts, 21396 and 3856, that added together give a palindrome (25252).

The spelling of 213963856 in words is "two hundred thirteen million, nine hundred sixty-three thousand, eight hundred fifty-six".