400534242221440 has 32 divisors (see below), whose sum is σ = 957527172812160. Its totient is φ = 160213696888320.

The previous prime is 400534242221417. The next prime is 400534242221441. The reversal of 400534242221440 is 44122242435004.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 400534242221440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400534242221441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312917376096 + ... + 312917377375.

It is an arithmetic number, because the mean of its divisors is an integer number (29922724150380).

Almost surely, 2^{400534242221440} is an apocalyptic number.

400534242221440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400534242221440 is an abundant number, since it is smaller than the sum of its proper divisors (556992930590720).

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

400534242221440 is an equidigital number, since it uses as much as digits as its factorization.

400534242221440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625834753490 (or 625834753478 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 37.

Adding to 400534242221440 its reverse (44122242435004), we get a palindrome (444656484656444).

The spelling of 400534242221440 in words is "four hundred trillion, five hundred thirty-four billion, two hundred forty-two million, two hundred twenty-one thousand, four hundred forty".