396205131809 has 4 divisors (see below), whose sum is σ = 396291436800. Its totient is φ = 396118826820.

The previous prime is 396205131781. The next prime is 396205131823. The reversal of 396205131809 is 908131502693.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 908131502693 = 31 ⋅29294564603.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-396205131809 is a prime.

It is a super-2 number, since 2×396205131809² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (396205131869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43145609 + ... + 43154790.

It is an arithmetic number, because the mean of its divisors is an integer number (99072859200).

Almost surely, 2^396205131809 is an apocalyptic number.

It is an amenable number.

396205131809 is a deficient number, since it is larger than the sum of its proper divisors (86304991).

396205131809 is an equidigital number, since it uses as much as digits as its factorization.

396205131809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86304990.

The product of its (nonzero) digits is 349920, while the sum is 47.

The spelling of 396205131809 in words is "three hundred ninety-six billion, two hundred five million, one hundred thirty-one thousand, eight hundred nine".