405839449 has 6 divisors (see below), whose sum is σ = 428324010. Its totient is φ = 384479136.

The previous prime is 405839381. The next prime is 405839491. The reversal of 405839449 is 944938504.

It can be written as a sum of positive squares in only one way, i.e., 254721600 + 151117849 = 15960^2 + 12293^2 .

It is not a de Polignac number, because 405839449 - 2¹¹ = 405837401 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 405839399 and 405839408.

It is not an unprimeable number, because it can be changed into a prime (405839849) 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 5 ways as a sum of consecutive naturals, for example, 561744 + ... + 562465.

It is an arithmetic number, because the mean of its divisors is an integer number (71387335).

Almost surely, 2^405839449 is an apocalyptic number.

It is an amenable number.

405839449 is a deficient number, since it is larger than the sum of its proper divisors (22484561).

405839449 is a wasteful number, since it uses less digits than its factorization.

405839449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124247 (or 1124228 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 405839449 is about 20145.4572794960. The cubic root of 405839449 is about 740.3744446579.

The spelling of 405839449 in words is "four hundred five million, eight hundred thirty-nine thousand, four hundred forty-nine".