215184140 has 24 divisors (see below), whose sum is σ = 457334640. Its totient is φ = 85035968.

The previous prime is 215184133. The next prime is 215184199. The reversal of 215184140 is 41481512.

215184140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63155 + ... + 66474.

It is an arithmetic number, because the mean of its divisors is an integer number (19055610).

Almost surely, 2^215184140 is an apocalyptic number.

215184140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215184140 is an abundant number, since it is smaller than the sum of its proper divisors (242150500).

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

215184140 is a wasteful number, since it uses less digits than its factorization.

215184140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129721 (or 129719 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 215184140 is about 14669.1560766119. The cubic root of 215184140 is about 599.2436209593.

The spelling of 215184140 in words is "two hundred fifteen million, one hundred eighty-four thousand, one hundred forty".