1887721925 has 6 divisors (see below), whose sum is σ = 2340775218. Its totient is φ = 1510177520.

The previous prime is 1887721909. The next prime is 1887721937. The reversal of 1887721925 is 5291277881.

It can be written as a sum of positive squares in 3 ways, for example, as 448126561 + 1439595364 = 21169^2 + 37942^2 .

It is not a de Polignac number, because 1887721925 - 2⁴ = 1887721909 is a prime.

It is a super-2 number, since 2×1887721925² = 7126988132251411250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 37754414 + ... + 37754463.

It is an arithmetic number, because the mean of its divisors is an integer number (390129203).

Almost surely, 2^1887721925 is an apocalyptic number.

It is an amenable number.

1887721925 is a deficient number, since it is larger than the sum of its proper divisors (453053293).

1887721925 is an equidigital number, since it uses as much as digits as its factorization.

1887721925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75508887 (or 75508882 counting only the distinct ones).

The product of its digits is 564480, while the sum is 50.

The square root of 1887721925 is about 43447.9219871331. The cubic root of 1887721925 is about 1235.8886390612. Note that the first 3 decimals are identical.

The spelling of 1887721925 in words is "one billion, eight hundred eighty-seven million, seven hundred twenty-one thousand, nine hundred twenty-five".