1987822225 has 27 divisors (see below), whose sum is σ = 2543874291. Its totient is φ = 1540857600.

The previous prime is 1987822201. The next prime is 1987822241. The reversal of 1987822225 is 5222287891.

The square root of 1987822225 is 44585.

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 84768849 + 1903053376 = 9207^2 + 43624^2 .

It is not a de Polignac number, because 1987822225 - 2¹⁹ = 1987297937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 8248105 + ... + 8248345.

Almost surely, 2^1987822225 is an apocalyptic number.

1987822225 is the 44585-th square number.

1987822225 is the 22293-rd centered octagonal number.

It is an amenable number.

1987822225 is a deficient number, since it is larger than the sum of its proper divisors (556052066).

1987822225 is an frugal number, since it uses more digits than its factorization.

1987822225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566 (or 283 counting only the distinct ones).

The product of its digits is 322560, while the sum is 46.

The cubic root of 1987822225 is about 1257.3586696441.

The spelling of 1987822225 in words is "one billion, nine hundred eighty-seven million, eight hundred twenty-two thousand, two hundred twenty-five".