409521872 has 20 divisors (see below), whose sum is σ = 801307716. Its totient is φ = 202732800.

The previous prime is 409521869. The next prime is 409521911. The reversal of 409521872 is 278125904.

It can be written as a sum of positive squares in 2 ways, for example, as 247621696 + 161900176 = 15736^2 + 12724^2 .

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 3 ways as a sum of consecutive naturals, for example, 125093 + ... + 128324.

Almost surely, 2^409521872 is an apocalyptic number.

It is an amenable number.

409521872 is a deficient number, since it is larger than the sum of its proper divisors (391785844).

409521872 is a wasteful number, since it uses less digits than its factorization.

409521872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253526 (or 253520 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 409521872 is about 20236.6467578006. The cubic root of 409521872 is about 742.6069918791.

It can be divided in two parts, 40952 and 1872, that added together give a palindrome (42824).

The spelling of 409521872 in words is "four hundred nine million, five hundred twenty-one thousand, eight hundred seventy-two".