1881390625 has 21 divisors (see below), whose sum is σ = 2358504967. Its totient is φ = 1500775000.

The previous prime is 1881390617. The next prime is 1881390647. The reversal of 1881390625 is 5260931881.

The square root of 1881390625 is 43375.

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

It can be written as a sum of positive squares in 3 ways, for example, as 1648278801 + 233111824 = 40599^2 + 15268^2 .

It is not a de Polignac number, because 1881390625 - 2³ = 1881390617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 5421702 + ... + 5422048.

Almost surely, 2^1881390625 is an apocalyptic number.

1881390625 is the 43375-th square number.

1881390625 is the 21688-th centered octagonal number.

It is an amenable number.

1881390625 is a deficient number, since it is larger than the sum of its proper divisors (477114342).

1881390625 is an frugal number, since it uses more digits than its factorization.

1881390625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724 (or 352 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The cubic root of 1881390625 is about 1234.5053940125.

The spelling of 1881390625 in words is "one billion, eight hundred eighty-one million, three hundred ninety thousand, six hundred twenty-five".