2172345 has 32 divisors (see below), whose sum is σ = 4209408. Its totient is φ = 933888.

The previous prime is 2172343. The next prime is 2172347. The reversal of 2172345 is 5432712.

It is an interprime number because it is at equal distance from previous prime (2172343) and next prime (2172347).

It is not a de Polignac number, because 2172345 - 2¹ = 2172343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2172343) 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, 1177 + ... + 2393.

It is an arithmetic number, because the mean of its divisors is an integer number (131544).

2^2172345 is an apocalyptic number.

It is an amenable number.

2172345 is a deficient number, since it is larger than the sum of its proper divisors (2037063).

2172345 is a wasteful number, since it uses less digits than its factorization.

2172345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249.

The product of its digits is 1680, while the sum is 24.

The square root of 2172345 is about 1473.8877162118. The cubic root of 2172345 is about 129.5118775846.

The spelling of 2172345 in words is "two million, one hundred seventy-two thousand, three hundred forty-five".