404640420 has 24 divisors (see below), whose sum is σ = 1132993344. Its totient is φ = 107904096.

The previous prime is 404640407. The next prime is 404640421. The reversal of 404640420 is 24046404.

It is not an unprimeable number, because it can be changed into a prime (404640421) 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, 3371944 + ... + 3372063.

It is an arithmetic number, because the mean of its divisors is an integer number (47208056).

Almost surely, 2^404640420 is an apocalyptic number.

It is an amenable number.

404640420 is an abundant number, since it is smaller than the sum of its proper divisors (728352924).

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

404640420 is a wasteful number, since it uses less digits than its factorization.

404640420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6744019 (or 6744017 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 404640420 is about 20115.6759767103. The cubic root of 404640420 is about 739.6445943692.

Adding to 404640420 its reverse (24046404), we get a palindrome (428686824).

The spelling of 404640420 in words is "four hundred four million, six hundred forty thousand, four hundred twenty".