216830393 has 8 divisors (see below), whose sum is σ = 247245768. Its totient is φ = 188377344.

The previous prime is 216830387. The next prime is 216830401. The reversal of 216830393 is 393038612.

It can be written as a sum of positive squares in 4 ways, for example, as 64850809 + 151979584 = 8053^2 + 12328^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 216830393 - 2⁴ = 216830377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216830333) 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, 490346 + ... + 490787.

It is an arithmetic number, because the mean of its divisors is an integer number (30905721).

Almost surely, 2^216830393 is an apocalyptic number.

It is an amenable number.

216830393 is a deficient number, since it is larger than the sum of its proper divisors (30415375).

216830393 is a wasteful number, since it uses less digits than its factorization.

216830393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981163.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 216830393 is about 14725.1619006380. The cubic root of 216830393 is about 600.7678992062.

The spelling of 216830393 in words is "two hundred sixteen million, eight hundred thirty thousand, three hundred ninety-three".