215132240 has 40 divisors (see below), whose sum is σ = 500810208. Its totient is φ = 85944960.

The previous prime is 215132227. The next prime is 215132251. The reversal of 215132240 is 42231512.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 102239 + ... + 104321.

Almost surely, 2^215132240 is an apocalyptic number.

215132240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215132240 is an abundant number, since it is smaller than the sum of its proper divisors (285677968).

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

215132240 is a wasteful number, since it uses less digits than its factorization.

215132240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3387 (or 3381 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 215132240 is about 14667.3869520102. The cubic root of 215132240 is about 599.1954401398.

Adding to 215132240 its reverse (42231512), we get a palindrome (257363752).

The spelling of 215132240 in words is "two hundred fifteen million, one hundred thirty-two thousand, two hundred forty".