1805825025 has 27 divisors (see below), whose sum is σ = 3235575369. Its totient is φ = 962766720.

The previous prime is 1805824987. The next prime is 1805825027. The reversal of 1805825025 is 5205285081.

The square root of 1805825025 is 42495.

It is a perfect power (a square), and thus also a powerful number.

1805825025 is a `hidden beast` number, since 1 + 8 + 0 + 582 + 50 + 25 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 110691441 + 1695133584 = 10521^2 + 41172^2 .

It is not a de Polignac number, because 1805825025 - 2⁹ = 1805824513 is a prime.

It is a super-2 number, since 2×1805825025² = 6522008041832501250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1805825027) 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 26 ways as a sum of consecutive naturals, for example, 636009 + ... + 638841.

Almost surely, 2^1805825025 is an apocalyptic number.

1805825025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1805825025 is the 42495-th square number.

1805825025 is the 21248-th centered octagonal number.

It is an amenable number.

1805825025 is a deficient number, since it is larger than the sum of its proper divisors (1429750344).

1805825025 is an frugal number, since it uses more digits than its factorization.

1805825025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5682 (or 2841 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 36.

The cubic root of 1805825025 is about 1217.7511705853.

Multiplying 1805825025 by its sum of digits (36), we get a square (65009700900 = 254970²).

The spelling of 1805825025 in words is "one billion, eight hundred five million, eight hundred twenty-five thousand, twenty-five".