217045386 has 16 divisors (see below), whose sum is σ = 482323200. Its totient is φ = 72348444.

The previous prime is 217045373. The next prime is 217045393. The reversal of 217045386 is 683540712.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 217045386.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2009626 + ... + 2009733.

It is an arithmetic number, because the mean of its divisors is an integer number (30145200).

Almost surely, 2^217045386 is an apocalyptic number.

217045386 is an abundant number, since it is smaller than the sum of its proper divisors (265277814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217045386 is a wasteful number, since it uses less digits than its factorization.

217045386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4019370 (or 4019364 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 217045386 is about 14732.4602833335. The cubic root of 217045386 is about 600.9663926398.

It can be divided in two parts, 21 and 7045386, that added together give a palindrome (7045407).

The spelling of 217045386 in words is "two hundred seventeen million, forty-five thousand, three hundred eighty-six".