2172717 has 8 divisors (see below), whose sum is σ = 3218880. Its totient is φ = 1448460.

The previous prime is 2172701. The next prime is 2172721. The reversal of 2172717 is 7172712.

It is not a de Polignac number, because 2172717 - 2⁴ = 2172701 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 80471 = 2172717 / (2 + 1 + 7 + 2 + 7 + 1 + 7).

2172717 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40209 + ... + 40262.

It is an arithmetic number, because the mean of its divisors is an integer number (402360).

2^2172717 is an apocalyptic number.

2172717 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2172717 is a deficient number, since it is larger than the sum of its proper divisors (1046163).

2172717 is an equidigital number, since it uses as much as digits as its factorization.

2172717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80480 (or 80474 counting only the distinct ones).

The product of its digits is 1372, while the sum is 27.

The square root of 2172717 is about 1474.0139076684. The cubic root of 2172717 is about 129.5192698525.

The spelling of 2172717 in words is "two million, one hundred seventy-two thousand, seven hundred seventeen".