1821925 has 24 divisors (see below), whose sum is σ = 2678400. Its totient is φ = 1202880.

The previous prime is 1821923. The next prime is 1821943. The reversal of 1821925 is 5291281.

It is not a de Polignac number, because 1821925 - 2¹ = 1821923 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1821893 and 1821902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821923) 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 23 ways as a sum of consecutive naturals, for example, 4896 + ... + 5254.

It is an arithmetic number, because the mean of its divisors is an integer number (111600).

2^1821925 is an apocalyptic number.

It is an amenable number.

1821925 is a deficient number, since it is larger than the sum of its proper divisors (856475).

1821925 is a wasteful number, since it uses less digits than its factorization.

1821925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405 (or 400 counting only the distinct ones).

The product of its digits is 1440, while the sum is 28.

The square root of 1821925 is about 1349.7870202369. The cubic root of 1821925 is about 122.1359453863.

The spelling of 1821925 in words is "one million, eight hundred twenty-one thousand, nine hundred twenty-five".