405540404 has 12 divisors (see below), whose sum is σ = 719418084. Its totient is φ = 199992384.

The previous prime is 405540403. The next prime is 405540409. The reversal of 405540404 is 404045504.

It can be written as a sum of positive squares in 2 ways, for example, as 290020900 + 115519504 = 17030^2 + 10748^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405540403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 694127 + ... + 694710.

It is an arithmetic number, because the mean of its divisors is an integer number (59951507).

Almost surely, 2^405540404 is an apocalyptic number.

It is an amenable number.

405540404 is a deficient number, since it is larger than the sum of its proper divisors (313877680).

405540404 is a wasteful number, since it uses less digits than its factorization.

405540404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388914 (or 1388912 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 26.

The square root of 405540404 is about 20138.0337669793. The cubic root of 405540404 is about 740.1925503317.

Adding to 405540404 its reverse (404045504), we get a palindrome (809585908).

The spelling of 405540404 in words is "four hundred five million, five hundred forty thousand, four hundred four".