405731323 has 2 divisors, whose sum is σ = 405731324. Its totient is φ = 405731322.

The previous prime is 405731311. The next prime is 405731327. The reversal of 405731323 is 323137504.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405731323 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 405731291 and 405731300.

It is not a weakly prime, because it can be changed into another prime (405731327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202865661 + 202865662.

It is an arithmetic number, because the mean of its divisors is an integer number (202865662).

Almost surely, 2^405731323 is an apocalyptic number.

405731323 is a deficient number, since it is larger than the sum of its proper divisors (1).

405731323 is an equidigital number, since it uses as much as digits as its factorization.

405731323 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 28.

The square root of 405731323 is about 20142.7734684179. The cubic root of 405731323 is about 740.3086872605.

Adding to 405731323 its reverse (323137504), we get a palindrome (728868827).

The spelling of 405731323 in words is "four hundred five million, seven hundred thirty-one thousand, three hundred twenty-three".