216992458 has 4 divisors (see below), whose sum is σ = 325488690. Its totient is φ = 108496228.

The previous prime is 216992453. The next prime is 216992497. The reversal of 216992458 is 854299612.

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., 178837129 + 38155329 = 13373^2 + 6177^2 .

It is not an unprimeable number, because it can be changed into a prime (216992453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54248113 + ... + 54248116.

Almost surely, 2^216992458 is an apocalyptic number.

216992458 is a deficient number, since it is larger than the sum of its proper divisors (108496232).

216992458 is a wasteful number, since it uses less digits than its factorization.

216992458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108496231.

The product of its digits is 311040, while the sum is 46.

The square root of 216992458 is about 14730.6638682715. The cubic root of 216992458 is about 600.9175387484.

The spelling of 216992458 in words is "two hundred sixteen million, nine hundred ninety-two thousand, four hundred fifty-eight".