1820625 has 20 divisors (see below), whose sum is σ = 3036528. Its totient is φ = 970000.

The previous prime is 1820617. The next prime is 1820629. The reversal of 1820625 is 5260281.

It is not a de Polignac number, because 1820625 - 2³ = 1820617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1820595 and 1820604.

It is not an unprimeable number, because it can be changed into a prime (1820629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1390 + ... + 2360.

2^1820625 is an apocalyptic number.

1820625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1820625 is a deficient number, since it is larger than the sum of its proper divisors (1215903).

1820625 is an frugal number, since it uses more digits than its factorization.

1820625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994 (or 979 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1820625 is about 1349.3053768514. The cubic root of 1820625 is about 122.1068892125.

The spelling of 1820625 in words is "one million, eight hundred twenty thousand, six hundred twenty-five".