404320340 has 12 divisors (see below), whose sum is σ = 849072756. Its totient is φ = 161728128.

The previous prime is 404320337. The next prime is 404320351. The reversal of 404320340 is 43023404.

It is a happy number.

404320340 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 68624656 + 335695684 = 8284^2 + 18322^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 20216017 = 404320340 / (4 + 0 + 4 + 3 + 2 + 0 + 3 + 4 + 0).

It is a congruent number.

It is an unprimeable number.

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, 10107989 + ... + 10108028.

It is an arithmetic number, because the mean of its divisors is an integer number (70756063).

Almost surely, 2^404320340 is an apocalyptic number.

It is an amenable number.

404320340 is an abundant number, since it is smaller than the sum of its proper divisors (444752416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

404320340 is a wasteful number, since it uses less digits than its factorization.

404320340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20216026 (or 20216024 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 404320340 is about 20107.7184185576. The cubic root of 404320340 is about 739.4495175543.

Adding to 404320340 its reverse (43023404), we get a palindrome (447343744).

The spelling of 404320340 in words is "four hundred four million, three hundred twenty thousand, three hundred forty".