1816890625 has 63 divisors (see below), whose sum is σ = 2579439639. Its totient is φ = 1278750000.

The previous prime is 1816890611. The next prime is 1816890631. The reversal of 1816890625 is 5260986181.

The square root of 1816890625 is 42625.

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 1591770609 + 225120016 = 39897^2 + 15004^2 .

It is not a de Polignac number, because 1816890625 - 2¹³ = 1816882433 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 (13) of ones.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 58609360 + ... + 58609390.

Almost surely, 2^1816890625 is an apocalyptic number.

1816890625 is the 42625-th square number.

1816890625 is the 21313-rd centered octagonal number.

It is an amenable number.

1816890625 is a deficient number, since it is larger than the sum of its proper divisors (762549014).

1816890625 is an frugal number, since it uses more digits than its factorization.

1816890625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 46.

The cubic root of 1816890625 is about 1220.2334555030.

The spelling of 1816890625 in words is "one billion, eight hundred sixteen million, eight hundred ninety thousand, six hundred twenty-five".