409860025 has 9 divisors (see below), whose sum is σ = 508351981. Its totient is φ = 327807040.

The previous prime is 409860019. The next prime is 409860097. The reversal of 409860025 is 520068904.

It is a happy number.

The square root of 409860025 is 20245.

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

It can be written as a sum of positive squares in 4 ways, for example, as 65237929 + 344622096 = 8077^2 + 18564^2 .

It is not a de Polignac number, because 409860025 - 2¹³ = 409851833 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 (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 99201 + ... + 103249.

Almost surely, 2^409860025 is an apocalyptic number.

409860025 is the 20245-th square number.

409860025 is the 10123-rd centered octagonal number.

It is an amenable number.

409860025 is a deficient number, since it is larger than the sum of its proper divisors (98491956).

409860025 is an frugal number, since it uses more digits than its factorization.

409860025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8108 (or 4054 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The cubic root of 409860025 is about 742.8113323663.

The spelling of 409860025 in words is "four hundred nine million, eight hundred sixty thousand, twenty-five".