216434 has 4 divisors (see below), whose sum is σ = 324654. Its totient is φ = 108216.

The previous prime is 216431. The next prime is 216451. The reversal of 216434 is 434612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 207025 + 9409 = 455^2 + 97^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54107 + ... + 54110.

2²¹⁶⁴³⁴ is an apocalyptic number.

216434 is a deficient number, since it is larger than the sum of its proper divisors (108220).

216434 is a wasteful number, since it uses less digits than its factorization.

216434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108219.

The product of its digits is 576, while the sum is 20.

The square root of 216434 is about 465.2246769035. The cubic root of 216434 is about 60.0401583010.

The spelling of 216434 in words is "two hundred sixteen thousand, four hundred thirty-four".