404320405 has 8 divisors (see below), whose sum is σ = 485520984. Its totient is φ = 323232000.

The previous prime is 404320403. The next prime is 404320409. The reversal of 404320405 is 504023404.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 69169 + 404251236 = 263^2 + 20106^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 404320405 - 2¹ = 404320403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404320403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19896 + ... + 34705.

It is an arithmetic number, because the mean of its divisors is an integer number (60690123).

Almost surely, 2^404320405 is an apocalyptic number.

It is an amenable number.

404320405 is a deficient number, since it is larger than the sum of its proper divisors (81200579).

404320405 is a wasteful number, since it uses less digits than its factorization.

404320405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56087.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 404320405 is about 20107.7200348523. The cubic root of 404320405 is about 739.4495571798.

Adding to 404320405 its reverse (504023404), we get a palindrome (908343809).

The spelling of 404320405 in words is "four hundred four million, three hundred twenty thousand, four hundred five".