215240 has 16 divisors (see below), whose sum is σ = 484380. Its totient is φ = 86080.

The previous prime is 215239. The next prime is 215249. The reversal of 215240 is 42512.

It can be written as a sum of positive squares in 2 ways, for example, as 209764 + 5476 = 458^2 + 74^2 .

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (215249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2651 + ... + 2730.

2²¹⁵²⁴⁰ is an apocalyptic number.

215240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215240 is an abundant number, since it is smaller than the sum of its proper divisors (269140).

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

215240 is a wasteful number, since it uses less digits than its factorization.

215240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5392 (or 5388 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 215240 is about 463.9396512479. The cubic root of 215240 is about 59.9295469348.

Adding to 215240 its reverse (42512), we get a palindrome (257752).

The spelling of 215240 in words is "two hundred fifteen thousand, two hundred forty".