216879842 has 8 divisors (see below), whose sum is σ = 325498716. Its totient is φ = 108380272.

The previous prime is 216879841. The next prime is 216879853. The reversal of 216879842 is 248978612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 203034001 + 13845841 = 14249^2 + 3721^2 .

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

It is not an unprimeable number, because it can be changed into a prime (216879841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25133 + ... + 32640.

Almost surely, 2^216879842 is an apocalyptic number.

216879842 is a deficient number, since it is larger than the sum of its proper divisors (108618874).

216879842 is a wasteful number, since it uses less digits than its factorization.

216879842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59652.

The product of its digits is 387072, while the sum is 47.

The square root of 216879842 is about 14726.8408696502. The cubic root of 216879842 is about 600.8135648736.

The spelling of 216879842 in words is "two hundred sixteen million, eight hundred seventy-nine thousand, eight hundred forty-two".