404246356440 has 128 divisors (see below), whose sum is σ = 1234741708800. Its totient is φ = 105847531520.

The previous prime is 404246356403. The next prime is 404246356447. The reversal of 404246356440 is 44653642404.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 404246356392 and 404246356401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404246356447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6076960 + ... + 6143120.

It is an arithmetic number, because the mean of its divisors is an integer number (9646419600).

Almost surely, 2^404246356440 is an apocalyptic number.

404246356440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 404246356440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (617370854400).

404246356440 is an abundant number, since it is smaller than the sum of its proper divisors (830495352360).

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

404246356440 is a wasteful number, since it uses less digits than its factorization.

404246356440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67097 (or 67093 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 42.

Adding to 404246356440 its reverse (44653642404), we get a palindrome (448899998844).

The spelling of 404246356440 in words is "four hundred four billion, two hundred forty-six million, three hundred fifty-six thousand, four hundred forty".