216342539 has 16 divisors (see below), whose sum is σ = 253793280. Its totient is φ = 180588960.

The previous prime is 216342509. The next prime is 216342541. The reversal of 216342539 is 935243612.

It is a cyclic number.

It is not a de Polignac number, because 216342539 - 2¹² = 216338443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216342499 and 216342508.

It is not an unprimeable number, because it can be changed into a prime (216342509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41522 + ... + 46440.

It is an arithmetic number, because the mean of its divisors is an integer number (15862080).

Almost surely, 2^216342539 is an apocalyptic number.

216342539 is a deficient number, since it is larger than the sum of its proper divisors (37450741).

216342539 is a wasteful number, since it uses less digits than its factorization.

216342539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5090.

The product of its digits is 38880, while the sum is 35.

The square root of 216342539 is about 14708.5872537100. The cubic root of 216342539 is about 600.3169982314.

The spelling of 216342539 in words is "two hundred sixteen million, three hundred forty-two thousand, five hundred thirty-nine".