405244769 has 2 divisors, whose sum is σ = 405244770. Its totient is φ = 405244768.

The previous prime is 405244747. The next prime is 405244817. The reversal of 405244769 is 967442504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 351075169 + 54169600 = 18737^2 + 7360^2 .

It is a cyclic number.

It is not a de Polignac number, because 405244769 - 2¹⁶ = 405179233 is a prime.

It is a super-2 number, since 2×405244769² = 328446645603726722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (405244069) 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 as a sum of consecutive naturals, namely, 202622384 + 202622385.

It is an arithmetic number, because the mean of its divisors is an integer number (202622385).

Almost surely, 2^405244769 is an apocalyptic number.

It is an amenable number.

405244769 is a deficient number, since it is larger than the sum of its proper divisors (1).

405244769 is an equidigital number, since it uses as much as digits as its factorization.

405244769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 405244769 is about 20130.6922136324. The cubic root of 405244769 is about 740.0126422238.

The spelling of 405244769 in words is "four hundred five million, two hundred forty-four thousand, seven hundred sixty-nine".