1871860225 has 27 divisors (see below), whose sum is σ = 2470527547. Its totient is φ = 1406631680.

The previous prime is 1871860223. The next prime is 1871860261. The reversal of 1871860225 is 5220681781.

The square root of 1871860225 is 43265.

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

It can be written as a sum of positive squares in 13 ways, for example, as 156575169 + 1715285056 = 12513^2 + 41416^2 .

It is not a de Polignac number, because 1871860225 - 2¹ = 1871860223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1871860223) 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, 3677271 + ... + 3677779.

Almost surely, 2^1871860225 is an apocalyptic number.

1871860225 is the 43265-th square number.

1871860225 is the 21633-rd centered octagonal number.

It is an amenable number.

1871860225 is a deficient number, since it is larger than the sum of its proper divisors (598667322).

1871860225 is an frugal number, since it uses more digits than its factorization.

1871860225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 40.

The cubic root of 1871860225 is about 1232.4173547437.

The spelling of 1871860225 in words is "one billion, eight hundred seventy-one million, eight hundred sixty thousand, two hundred twenty-five".