217280407 has 8 divisors (see below), whose sum is σ = 218405376. Its totient is φ = 216159192.

The previous prime is 217280387. The next prime is 217280423. The reversal of 217280407 is 704082712.

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 217280407 - 2¹¹ = 217278359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217280477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244518 + ... + 245404.

It is an arithmetic number, because the mean of its divisors is an integer number (27300672).

Almost surely, 2^217280407 is an apocalyptic number.

217280407 is a deficient number, since it is larger than the sum of its proper divisors (1124969).

217280407 is an equidigital number, since it uses as much as digits as its factorization.

217280407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1877.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 217280407 is about 14740.4344237204. The cubic root of 217280407 is about 601.1832271258.

The spelling of 217280407 in words is "two hundred seventeen million, two hundred eighty thousand, four hundred seven".