215140 has 24 divisors (see below), whose sum is σ = 467712. Its totient is φ = 83040.

The previous prime is 215123. The next prime is 215141. The reversal of 215140 is 41512.

215140 = T₁₆ + T₁₇ + ... + T₁₀₈.

It is a self number, because there is not a number n which added to its sum of digits gives 215140.

It is not an unprimeable number, because it can be changed into a prime (215141) 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 7 ways as a sum of consecutive naturals, for example, 447 + ... + 793.

It is an arithmetic number, because the mean of its divisors is an integer number (19488).

2²¹⁵¹⁴⁰ is an apocalyptic number.

215140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233856).

215140 is an abundant number, since it is smaller than the sum of its proper divisors (252572).

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

215140 is a wasteful number, since it uses less digits than its factorization.

215140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 215140 is about 463.8318660894. The cubic root of 215140 is about 59.9202644547.

Adding to 215140 its reverse (41512), we get a palindrome (256652).

The spelling of 215140 in words is "two hundred fifteen thousand, one hundred forty".