2170245 has 32 divisors (see below), whose sum is σ = 4331520. Its totient is φ = 901440.

The previous prime is 2170243. The next prime is 2170247. The reversal of 2170245 is 5420712.

It is an interprime number because it is at equal distance from previous prime (2170243) and next prime (2170247).

It is not a de Polignac number, because 2170245 - 2¹ = 2170243 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2170241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 216 + ... + 2094.

It is an arithmetic number, because the mean of its divisors is an integer number (135360).

2^2170245 is an apocalyptic number.

It is an amenable number.

2170245 is a deficient number, since it is larger than the sum of its proper divisors (2161275).

2170245 is a wasteful number, since it uses less digits than its factorization.

2170245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1905.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 2170245 is about 1473.1751423371. The cubic root of 2170245 is about 129.4701312031.

Adding to 2170245 its reverse (5420712), we get a palindrome (7590957).

It can be divided in two parts, 2170 and 245, that added together give a triangular number (2415 = T₆₉).

The spelling of 2170245 in words is "two million, one hundred seventy thousand, two hundred forty-five".