405312243 has 16 divisors (see below), whose sum is σ = 627745536. Its totient is φ = 227809440.

The previous prime is 405312227. The next prime is 405312263. The reversal of 405312243 is 342213504.

It is not a de Polignac number, because 405312243 - 2⁴ = 405312227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (405312203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156921 + ... + 159482.

It is an arithmetic number, because the mean of its divisors is an integer number (39234096).

Almost surely, 2^405312243 is an apocalyptic number.

405312243 is a deficient number, since it is larger than the sum of its proper divisors (222433293).

405312243 is a wasteful number, since it uses less digits than its factorization.

405312243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316474.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 405312243 is about 20132.3680425329. The cubic root of 405312243 is about 740.0537111002.

Adding to 405312243 its reverse (342213504), we get a palindrome (747525747).

The spelling of 405312243 in words is "four hundred five million, three hundred twelve thousand, two hundred forty-three".