216969 has 8 divisors (see below), whose sum is σ = 298752. Its totient is φ = 139920.

The previous prime is 216967. The next prime is 216973. The reversal of 216969 is 969612.

It is a happy number.

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

It is not a de Polignac number, because 216969 - 2¹ = 216967 is a prime.

It is a super-2 number, since 2×216969² = 94151093922, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a plaindrome in base 13 and base 15.

It is not an unprimeable number, because it can be changed into a prime (216967) 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, 1074 + ... + 1259.

It is an arithmetic number, because the mean of its divisors is an integer number (37344).

2²¹⁶⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

216969 is a deficient number, since it is larger than the sum of its proper divisors (81783).

216969 is a wasteful number, since it uses less digits than its factorization.

216969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2367.

The product of its digits is 5832, while the sum is 33.

The square root of 216969 is about 465.7993130094. The cubic root of 216969 is about 60.0895883877.

The spelling of 216969 in words is "two hundred sixteen thousand, nine hundred sixty-nine".