404020404240 has 80 divisors (see below), whose sum is σ = 1253481605376. Its totient is φ = 107651174400.

The previous prime is 404020404197. The next prime is 404020404251. The reversal of 404020404240 is 42404020404.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 404020404240.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 388321 + ... + 979200.

Almost surely, 2^404020404240 is an apocalyptic number.

404020404240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

404020404240 is an abundant number, since it is smaller than the sum of its proper divisors (849461201136).

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

404020404240 is a wasteful number, since it uses less digits than its factorization.

404020404240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368768 (or 1368762 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 24.

Adding to 404020404240 its reverse (42404020404), we get a palindrome (446424424644).

The spelling of 404020404240 in words is "four hundred four billion, twenty million, four hundred four thousand, two hundred forty".