215245240 has 48 divisors (see below), whose sum is σ = 563376600. Its totient is φ = 73797696.

The previous prime is 215245237. The next prime is 215245291. The reversal of 215245240 is 42542512.

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 11 ways as a sum of consecutive naturals, for example, 52950 + ... + 56869.

Almost surely, 2^215245240 is an apocalyptic number.

215245240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215245240 is an abundant number, since it is smaller than the sum of its proper divisors (348131360).

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

215245240 is a wasteful number, since it uses less digits than its factorization.

215245240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109844 (or 109833 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 215245240 is about 14671.2385298583. The cubic root of 215245240 is about 599.3003325744.

Adding to 215245240 its reverse (42542512), we get a palindrome (257787752).

The spelling of 215245240 in words is "two hundred fifteen million, two hundred forty-five thousand, two hundred forty".