216039 has 16 divisors (see below), whose sum is σ = 313344. Its totient is φ = 132000.

The previous prime is 216037. The next prime is 216061. The reversal of 216039 is 930612.

216039 = 68² + 69² + ... + 98².

It is not a de Polignac number, because 216039 - 2¹ = 216037 is a prime.

216039 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2089 + ... + 2189.

It is an arithmetic number, because the mean of its divisors is an integer number (19584).

216039 is a Friedman number, since it can be written as 60^(2+1)+39, using all its digits and the basic arithmetic operations.

2²¹⁶⁰³⁹ is an apocalyptic number.

216039 is a deficient number, since it is larger than the sum of its proper divisors (97305).

216039 is a wasteful number, since it uses less digits than its factorization.

216039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 216039 is about 464.7999569707. The cubic root of 216039 is about 60.0036108938.

It can be divided in two parts, 21603 and 9, that added together give a palindrome (21612).

The spelling of 216039 in words is "two hundred sixteen thousand, thirty-nine".