2172825 has 60 divisors (see below), whose sum is σ = 4276140. Its totient is φ = 1088640.

The previous prime is 2172823. The next prime is 2172827. The reversal of 2172825 is 5282712.

It is an interprime number because it is at equal distance from previous prime (2172823) and next prime (2172827).

It can be written as a sum of positive squares in 6 ways, for example, as 20736 + 2152089 = 144^2 + 1467^2 .

It is not a de Polignac number, because 2172825 - 2¹ = 2172823 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172823) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 58707 + ... + 58743.

It is an arithmetic number, because the mean of its divisors is an integer number (71269).

2^2172825 is an apocalyptic number.

2172825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2172825 is a deficient number, since it is larger than the sum of its proper divisors (2103315).

2172825 is a wasteful number, since it uses less digits than its factorization.

2172825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 74 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 2172825 is about 1474.0505418743. The cubic root of 2172825 is about 129.5214158368.

The spelling of 2172825 in words is "two million, one hundred seventy-two thousand, eight hundred twenty-five".