409201620 has 96 divisors (see below), whose sum is σ = 1170505728. Its totient is φ = 106791552.

The previous prime is 409201609. The next prime is 409201621. The reversal of 409201620 is 26102904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409201621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 632137 + ... + 632783.

It is an arithmetic number, because the mean of its divisors is an integer number (12192768).

Almost surely, 2^409201620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 409201620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (585252864).

409201620 is an abundant number, since it is smaller than the sum of its proper divisors (761304108).

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

409201620 is a wasteful number, since it uses less digits than its factorization.

409201620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869 (or 867 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 409201620 is about 20228.7325356781. The cubic root of 409201620 is about 742.4133649442.

The spelling of 409201620 in words is "four hundred nine million, two hundred one thousand, six hundred twenty".