2117647 has 8 divisors (see below), whose sum is σ = 2429856. Its totient is φ = 1807872.

The previous prime is 2117623. The next prime is 2117651. The reversal of 2117647 is 7467112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2117647 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 (2117677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2043 + ... + 2899.

It is an arithmetic number, because the mean of its divisors is an integer number (303732).

2^2117647 is an apocalyptic number.

2117647 is a deficient number, since it is larger than the sum of its proper divisors (312209).

2117647 is an equidigital number, since it uses as much as digits as its factorization.

2117647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217.

The product of its digits is 2352, while the sum is 28.

The square root of 2117647 is about 1455.2137300067. The cubic root of 2117647 is about 128.4156208452.

It can be divided in two parts, 2 and 117647, that added together give a 6-th power (117649 = 7⁶).

The spelling of 2117647 in words is "two million, one hundred seventeen thousand, six hundred forty-seven".