404420423440 has 80 divisors (see below), whose sum is σ = 1026425483136. Its totient is φ = 146966169600.

The previous prime is 404420423423. The next prime is 404420423453. The reversal of 404420423440 is 44324024404.

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

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, 1208920 + ... + 1506760.

Almost surely, 2^404420423440 is an apocalyptic number.

404420423440 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 404420423440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (513212741568).

404420423440 is an abundant number, since it is smaller than the sum of its proper divisors (622005059696).

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

404420423440 is a wasteful number, since it uses less digits than its factorization.

404420423440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299408 (or 299402 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 31.

Adding to 404420423440 its reverse (44324024404), we get a palindrome (448744447844).

The spelling of 404420423440 in words is "four hundred four billion, four hundred twenty million, four hundred twenty-three thousand, four hundred forty".