2173645 has 8 divisors (see below), whose sum is σ = 2626560. Its totient is φ = 1726800.

The previous prime is 2173643. The next prime is 2173649. The reversal of 2173645 is 5463712.

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

It is not a de Polignac number, because 2173645 - 2¹ = 2173643 is a prime.

It is a super-3 number, since 3×2173645³ = 30809674085850933375, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2173643) 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, 685 + ... + 2194.

It is an arithmetic number, because the mean of its divisors is an integer number (328320).

2^2173645 is an apocalyptic number.

It is an amenable number.

2173645 is a deficient number, since it is larger than the sum of its proper divisors (452915).

2173645 is a wasteful number, since it uses less digits than its factorization.

2173645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3035.

The product of its digits is 5040, while the sum is 28.

The square root of 2173645 is about 1474.3286607809. The cubic root of 2173645 is about 129.5377071017.

The spelling of 2173645 in words is "two million, one hundred seventy-three thousand, six hundred forty-five".