400322520540 has 384 divisors, whose sum is σ = 1320115507200. Its totient is φ = 101764574208.

The previous prime is 400322520529. The next prime is 400322520569. The reversal of 400322520540 is 45025223004.

It is a happy number.

400322520540 is a `hidden beast` number, since 40 + 0 + 32 + 2 + 52 + 0 + 540 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 435606201 + ... + 435607119.

It is an arithmetic number, because the mean of its divisors is an integer number (3437800800).

Almost surely, 2^400322520540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400322520540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (660057753600).

400322520540 is an abundant number, since it is smaller than the sum of its proper divisors (919792986660).

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

400322520540 is a wasteful number, since it uses less digits than its factorization.

400322520540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405 (or 1385 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

Adding to 400322520540 its reverse (45025223004), we get a palindrome (445347743544).

The spelling of 400322520540 in words is "four hundred billion, three hundred twenty-two million, five hundred twenty thousand, five hundred forty".