2173890625 has 21 divisors (see below), whose sum is σ = 2724633093. Its totient is φ = 1734450000.

The previous prime is 2173890619. The next prime is 2173890647. The reversal of 2173890625 is 5260983712.

The square root of 2173890625 is 46625.

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

It can be written as a sum of positive squares in 10 ways, for example, as 1871687169 + 302203456 = 43263^2 + 17384^2 .

It is not a de Polignac number, because 2173890625 - 2³ = 2173890617 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 (11) of ones.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 5827939 + ... + 5828311.

It is an arithmetic number, because the mean of its divisors is an integer number (129744433).

Almost surely, 2^2173890625 is an apocalyptic number.

2173890625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2173890625 is the 46625-th square number.

2173890625 is the 23313-rd centered octagonal number.

It is an amenable number.

2173890625 is a deficient number, since it is larger than the sum of its proper divisors (550742468).

2173890625 is an frugal number, since it uses more digits than its factorization.

2173890625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 43.

The cubic root of 2173890625 is about 1295.4258623344.

The spelling of 2173890625 in words is "two billion, one hundred seventy-three million, eight hundred ninety thousand, six hundred twenty-five".