217030379 has 4 divisors (see below), whose sum is σ = 220708920. Its totient is φ = 213351840.

The previous prime is 217030357. The next prime is 217030409. The reversal of 217030379 is 973030712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 217030379 - 2¹² = 217026283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217032379) 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, 1839182 + ... + 1839299.

It is an arithmetic number, because the mean of its divisors is an integer number (55177230).

Almost surely, 2^217030379 is an apocalyptic number.

217030379 is a deficient number, since it is larger than the sum of its proper divisors (3678541).

217030379 is an equidigital number, since it uses as much as digits as its factorization.

217030379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3678540.

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 217030379 is about 14731.9509570186. The cubic root of 217030379 is about 600.9525416035.

The spelling of 217030379 in words is "two hundred seventeen million, thirty thousand, three hundred seventy-nine".