409785620 has 12 divisors (see below), whose sum is σ = 860549844. Its totient is φ = 163914240.

The previous prime is 409785599. The next prime is 409785647. The reversal of 409785620 is 26587904.

It can be written as a sum of positive squares in 2 ways, for example, as 224880016 + 184905604 = 14996^2 + 13598^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

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, 10244621 + ... + 10244660.

It is an arithmetic number, because the mean of its divisors is an integer number (71712487).

Almost surely, 2^409785620 is an apocalyptic number.

It is an amenable number.

409785620 is an abundant number, since it is smaller than the sum of its proper divisors (450764224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

409785620 is a wasteful number, since it uses less digits than its factorization.

409785620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20489290 (or 20489288 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 409785620 is about 20243.1623023677. The cubic root of 409785620 is about 742.7663802537.

The spelling of 409785620 in words is "four hundred nine million, seven hundred eighty-five thousand, six hundred twenty".