215133440 has 72 divisors (see below), whose sum is σ = 519650208. Its totient is φ = 85329920.

The previous prime is 215133403. The next prime is 215133463. The reversal of 215133440 is 44331512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167039 + ... + 168321.

It is an arithmetic number, because the mean of its divisors is an integer number (7217364).

Almost surely, 2^215133440 is an apocalyptic number.

215133440 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 215133440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259825104).

215133440 is an abundant number, since it is smaller than the sum of its proper divisors (304516768).

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

215133440 is a wasteful number, since it uses less digits than its factorization.

215133440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435 (or 1421 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 215133440 is about 14667.4278590351. The cubic root of 215133440 is about 599.1965542347.

Adding to 215133440 its reverse (44331512), we get a palindrome (259464952).

The spelling of 215133440 in words is "two hundred fifteen million, one hundred thirty-three thousand, four hundred forty".