215235240 has 192 divisors, whose sum is σ = 729449280. Its totient is φ = 50380800.

The previous prime is 215235221. The next prime is 215235269. The reversal of 215235240 is 42532512.

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 215235240.

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 47 ways as a sum of consecutive naturals, for example, 2218872 + ... + 2218968.

It is an arithmetic number, because the mean of its divisors is an integer number (3799215).

Almost surely, 2^215235240 is an apocalyptic number.

215235240 is a gapful number since it is divisible by the number (20) 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 215235240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (364724640).

215235240 is an abundant number, since it is smaller than the sum of its proper divisors (514214040).

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

215235240 is a wasteful number, since it uses less digits than its factorization.

215235240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 215235240 is about 14670.8977230434. The cubic root of 215235240 is about 599.2910515390.

Adding to 215235240 its reverse (42532512), we get a palindrome (257767752).

The spelling of 215235240 in words is "two hundred fifteen million, two hundred thirty-five thousand, two hundred forty".