213995784 has 64 divisors (see below), whose sum is σ = 568267200. Its totient is φ = 66963456.

The previous prime is 213995767. The next prime is 213995791. The reversal of 213995784 is 487599312.

It is a nialpdrome in base 11.

It is a zygodrome in base 11.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49452 + ... + 53604.

It is an arithmetic number, because the mean of its divisors is an integer number (8879175).

Almost surely, 2^213995784 is an apocalyptic number.

213995784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213995784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284133600).

213995784 is an abundant number, since it is smaller than the sum of its proper divisors (354271416).

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

213995784 is a wasteful number, since it uses less digits than its factorization.

213995784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4294 (or 4290 counting only the distinct ones).

The product of its digits is 544320, while the sum is 48.

The square root of 213995784 is about 14628.5947377046. The cubic root of 213995784 is about 598.1384749582.

The spelling of 213995784 in words is "two hundred thirteen million, nine hundred ninety-five thousand, seven hundred eighty-four".