409219928209 has 3 divisors (see below), whose sum is σ = 409220567913. Its totient is φ = 409219288506.

The previous prime is 409219928207. The next prime is 409219928291. The reversal of 409219928209 is 902829912904.

The square root of 409219928209 is 639703.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 409219928209 - 2¹ = 409219928207 is a prime.

It is a super-2 number, since 2×409219928209² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 409219928209.

It is not an unprimeable number, because it can be changed into a prime (409219928207) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 319852 + ... + 959554.

It is an arithmetic number, because the mean of its divisors is an integer number (136406855971).

Almost surely, 2^409219928209 is an apocalyptic number.

409219928209 is the 639703-rd square number.

409219928209 is the 319852-nd centered octagonal number.

It is an amenable number.

409219928209 is a deficient number, since it is larger than the sum of its proper divisors (639704).

409219928209 is an frugal number, since it uses more digits than its factorization.

409219928209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279406 (or 639703 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 55.

The spelling of 409219928209 in words is "four hundred nine billion, two hundred nineteen million, nine hundred twenty-eight thousand, two hundred nine".