216004 has 6 divisors (see below), whose sum is σ = 378014. Its totient is φ = 108000.

The previous prime is 215983. The next prime is 216023. The reversal of 216004 is 400612.

216004 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 158404 + 57600 = 398^2 + 240^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26997 + ... + 27004.

216004 is a Friedman number, since it can be written as 60^(2+1+0)+4, using all its digits and the basic arithmetic operations.

2²¹⁶⁰⁰⁴ is an apocalyptic number.

It is an amenable number.

216004 is a deficient number, since it is larger than the sum of its proper divisors (162010).

216004 is a wasteful number, since it uses less digits than its factorization.

216004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54005 (or 54003 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 216004 is about 464.7623048398. The cubic root of 216004 is about 60.0003703681. Note that the first 3 decimals are identical.

Adding to 216004 its reverse (400612), we get a palindrome (616616).

The spelling of 216004 in words is "two hundred sixteen thousand, four".