215355240 has 64 divisors (see below), whose sum is σ = 717854400. Its totient is φ = 57427776.

The previous prime is 215355221. The next prime is 215355241. The reversal of 215355240 is 42553512.

It is a happy number.

215355240 is a `hidden beast` number, since 21 + 53 + 552 + 40 = 666.

215355240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (215355241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98622 + ... + 100781.

It is an arithmetic number, because the mean of its divisors is an integer number (11216475).

Almost surely, 2^215355240 is an apocalyptic number.

215355240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215355240 is an abundant number, since it is smaller than the sum of its proper divisors (502499160).

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

215355240 is a wasteful number, since it uses less digits than its factorization.

215355240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199423 (or 199413 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 215355240 is about 14674.9868824473. The cubic root of 215355240 is about 599.4024049980.

The spelling of 215355240 in words is "two hundred fifteen million, three hundred fifty-five thousand, two hundred forty".