213893784 has 80 divisors (see below), whose sum is σ = 645210720. Its totient is φ = 65810880.

The previous prime is 213893759. The next prime is 213893803. The reversal of 213893784 is 487398312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4272 + ... + 21119.

It is an arithmetic number, because the mean of its divisors is an integer number (8065134).

Almost surely, 2^213893784 is an apocalyptic number.

213893784 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 213893784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (322605360).

213893784 is an abundant number, since it is smaller than the sum of its proper divisors (431316936).

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

213893784 is a wasteful number, since it uses less digits than its factorization.

213893784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25422 (or 25409 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 213893784 is about 14625.1079996012. The cubic root of 213893784 is about 598.0434266364.

The spelling of 213893784 in words is "two hundred thirteen million, eight hundred ninety-three thousand, seven hundred eighty-four".