215439 has 8 divisors (see below), whose sum is σ = 328320. Its totient is φ = 123096.

The previous prime is 215417. The next prime is 215443. The reversal of 215439 is 934512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 215439 - 2⁸ = 215183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215459) 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, 5109 + ... + 5150.

It is an arithmetic number, because the mean of its divisors is an integer number (41040).

2²¹⁵⁴³⁹ is an apocalyptic number.

215439 is a deficient number, since it is larger than the sum of its proper divisors (112881).

215439 is a wasteful number, since it uses less digits than its factorization.

215439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10269.

The product of its digits is 1080, while the sum is 24.

The square root of 215439 is about 464.1540692486. The cubic root of 215439 is about 59.9480105201.

It can be divided in two parts, 21 and 5439, that added together give a triangular number (5460 = T₁₀₄).

The spelling of 215439 in words is "two hundred fifteen thousand, four hundred thirty-nine".