409221238397 has 4 divisors (see below), whose sum is σ = 414827008860. Its totient is φ = 403615467936.

The previous prime is 409221238343. The next prime is 409221238399. The reversal of 409221238397 is 793832122904.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 244341387481 + 164879850916 = 494309^2 + 406054^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-409221238397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409221238399) 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, 2802885122 + ... + 2802885267.

It is an arithmetic number, because the mean of its divisors is an integer number (103706752215).

Almost surely, 2^409221238397 is an apocalyptic number.

It is an amenable number.

409221238397 is a deficient number, since it is larger than the sum of its proper divisors (5605770463).

409221238397 is an equidigital number, since it uses as much as digits as its factorization.

409221238397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5605770462.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 409221238397 in words is "four hundred nine billion, two hundred twenty-one million, two hundred thirty-eight thousand, three hundred ninety-seven".