404421304040 has 64 divisors (see below), whose sum is σ = 982070202960. Its totient is φ = 149000785920.

The previous prime is 404421304039. The next prime is 404421304207. The reversal of 404421304040 is 40403124404.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2574344644 + 401846959396 = 50738^2 + 633914^2 .

It is a super-2 number, since 2×404421304040² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

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, 603809 + ... + 1083248.

Almost surely, 2^404421304040 is an apocalyptic number.

404421304040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

404421304040 is an abundant number, since it is smaller than the sum of its proper divisors (577648898920).

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

404421304040 is a wasteful number, since it uses less digits than its factorization.

404421304040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1687542 (or 1687538 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 404421304040 its reverse (40403124404), we get a palindrome (444824428444).

The spelling of 404421304040 in words is "four hundred four billion, four hundred twenty-one million, three hundred four thousand, forty".