215006440 has 32 divisors (see below), whose sum is σ = 527744160. Its totient is φ = 78184000.

The previous prime is 215006383. The next prime is 215006447. The reversal of 215006440 is 44600512.

215006440 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 (22).

It is not an unprimeable number, because it can be changed into a prime (215006447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243886 + ... + 244765.

It is an arithmetic number, because the mean of its divisors is an integer number (16492005).

Almost surely, 2^215006440 is an apocalyptic number.

215006440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215006440 is an abundant number, since it is smaller than the sum of its proper divisors (312737720).

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

215006440 is a wasteful number, since it uses less digits than its factorization.

215006440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488673 (or 488669 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 215006440 is about 14663.0978991481. The cubic root of 215006440 is about 599.0786228683.

Adding to 215006440 its reverse (44600512), we get a palindrome (259606952).

The spelling of 215006440 in words is "two hundred fifteen million, six thousand, four hundred forty".