2138225 has 18 divisors (see below), whose sum is σ = 2770470. Its totient is φ = 1636800.

The previous prime is 2138221. The next prime is 2138231. The reversal of 2138225 is 5228312.

It can be written as a sum of positive squares in 3 ways, for example, as 15376 + 2122849 = 124^2 + 1457^2 .

It is not a de Polignac number, because 2138225 - 2² = 2138221 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2138225.

It is not an unprimeable number, because it can be changed into a prime (2138221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 23981 + ... + 24069.

It is an arithmetic number, because the mean of its divisors is an integer number (153915).

2^2138225 is an apocalyptic number.

2138225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2138225 is a deficient number, since it is larger than the sum of its proper divisors (632245).

2138225 is an equidigital number, since it uses as much as digits as its factorization.

2138225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 125 counting only the distinct ones).

The product of its digits is 960, while the sum is 23.

The square root of 2138225 is about 1462.2670754688. The cubic root of 2138225 is about 128.8302355942.

The spelling of 2138225 in words is "two million, one hundred thirty-eight thousand, two hundred twenty-five".