217323393 has 16 divisors (see below), whose sum is σ = 350640000. Its totient is φ = 116879616.

The previous prime is 217323383. The next prime is 217323401. The reversal of 217323393 is 393323712.

It is not a de Polignac number, because 217323393 - 2⁹ = 217322881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (217323383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 304018 + ... + 304731.

It is an arithmetic number, because the mean of its divisors is an integer number (21915000).

Almost surely, 2^217323393 is an apocalyptic number.

It is an amenable number.

217323393 is a deficient number, since it is larger than the sum of its proper divisors (133316607).

217323393 is a wasteful number, since it uses less digits than its factorization.

217323393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608776.

The product of its digits is 20412, while the sum is 33.

The square root of 217323393 is about 14741.8924497501. The cubic root of 217323393 is about 601.2228698446. Note that the first 3 decimals are identical.

It can be divided in two parts, 217 and 323393, that added together give a triangular number (323610 = T₈₀₄).

The spelling of 217323393 in words is "two hundred seventeen million, three hundred twenty-three thousand, three hundred ninety-three".