1638325 has 18 divisors (see below), whose sum is σ = 2219042. Its totient is φ = 1192800.

The previous prime is 1638311. The next prime is 1638331. The reversal of 1638325 is 5238361.

It can be written as a sum of positive squares in 3 ways, for example, as 5041 + 1633284 = 71^2 + 1278^2 .

It is not a de Polignac number, because 1638325 - 2⁹ = 1637813 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 1638293 and 1638302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 23040 + ... + 23110.

2^1638325 is an apocalyptic number.

It is an amenable number.

1638325 is a deficient number, since it is larger than the sum of its proper divisors (580717).

1638325 is an equidigital number, since it uses as much as digits as its factorization.

1638325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165 (or 89 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 1638325 is about 1279.9707027897. The cubic root of 1638325 is about 117.8872090855.

The spelling of 1638325 in words is "one million, six hundred thirty-eight thousand, three hundred twenty-five".