216996426 has 12 divisors (see below), whose sum is σ = 470158962. Its totient is φ = 72332136.

The previous prime is 216996413. The next prime is 216996427. The reversal of 216996426 is 624699612.

216996426 is a `hidden beast` number, since 216 + 9 + 9 + 6 + 426 = 666.

It can be written as a sum of positive squares in only one way, i.e., 171636201 + 45360225 = 13101^2 + 6735^2 .

It is not an unprimeable number, because it can be changed into a prime (216996427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6027661 + ... + 6027696.

Almost surely, 2^216996426 is an apocalyptic number.

216996426 is an abundant number, since it is smaller than the sum of its proper divisors (253162536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216996426 is a wasteful number, since it uses less digits than its factorization.

216996426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12055365 (or 12055362 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 216996426 is about 14730.7985526922. The cubic root of 216996426 is about 600.9212015889.

The spelling of 216996426 in words is "two hundred sixteen million, nine hundred ninety-six thousand, four hundred twenty-six".