213543240 has 64 divisors (see below), whose sum is σ = 662731200. Its totient is φ = 54980352.

The previous prime is 213543233. The next prime is 213543251. The reversal of 213543240 is 42345312.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 213543240.

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, 27202 + ... + 34161.

It is an arithmetic number, because the mean of its divisors is an integer number (10355175).

Almost surely, 2^213543240 is an apocalyptic number.

213543240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213543240 is an abundant number, since it is smaller than the sum of its proper divisors (449187960).

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

213543240 is a wasteful number, since it uses less digits than its factorization.

213543240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61406 (or 61402 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 213543240 is about 14613.1187636315. The cubic root of 213543240 is about 597.7165429531.

Adding to 213543240 its reverse (42345312), we get a palindrome (255888552).

The spelling of 213543240 in words is "two hundred thirteen million, five hundred forty-three thousand, two hundred forty".