215201440 has 24 divisors (see below), whose sum is σ = 508413780. Its totient is φ = 86080512.

The previous prime is 215201417. The next prime is 215201443. The reversal of 215201440 is 44102512.

215201440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 201980944 + 13220496 = 14212^2 + 3636^2 .

It is not an unprimeable number, because it can be changed into a prime (215201443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 672345 + ... + 672664.

Almost surely, 2^215201440 is an apocalyptic number.

215201440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215201440 is an abundant number, since it is smaller than the sum of its proper divisors (293212340).

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

215201440 is a wasteful number, since it uses less digits than its factorization.

215201440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345024 (or 1345016 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 215201440 is about 14669.7457374012. The cubic root of 215201440 is about 599.2596795109.

Adding to 215201440 its reverse (44102512), we get a palindrome (259303952).

The spelling of 215201440 in words is "two hundred fifteen million, two hundred one thousand, four hundred forty".