1825645 has 4 divisors (see below), whose sum is σ = 2190780. Its totient is φ = 1460512.

The previous prime is 1825631. The next prime is 1825661. The reversal of 1825645 is 5465281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 797449 + 1028196 = 893^2 + 1014^2 .

It is a cyclic number.

It is not a de Polignac number, because 1825645 - 2⁷ = 1825517 is a prime.

It is a super-3 number, since 3×1825645³ = 18254512987140633375, which contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182560 + ... + 182569.

It is an arithmetic number, because the mean of its divisors is an integer number (547695).

2^1825645 is an apocalyptic number.

It is an amenable number.

1825645 is a deficient number, since it is larger than the sum of its proper divisors (365135).

1825645 is an equidigital number, since it uses as much as digits as its factorization.

1825645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365134.

The product of its digits is 9600, while the sum is 31.

The square root of 1825645 is about 1351.1643127318. The cubic root of 1825645 is about 122.2190144551.

The spelling of 1825645 in words is "one million, eight hundred twenty-five thousand, six hundred forty-five".