400530540 has 192 divisors, whose sum is σ = 1254113280. Its totient is φ = 95047680.

The previous prime is 400530511. The next prime is 400530541. The reversal of 400530540 is 45035004.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (400530541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1675741 + ... + 1675979.

It is an arithmetic number, because the mean of its divisors is an integer number (6531840).

Almost surely, 2^400530540 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 400530540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (627056640).

400530540 is an abundant number, since it is smaller than the sum of its proper divisors (853582740).

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

400530540 is a wasteful number, since it uses less digits than its factorization.

400530540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 400530540 is about 20013.2591049034. The cubic root of 400530540 is about 737.1319101579.

Adding to 400530540 its reverse (45035004), we get a palindrome (445565544).

The spelling of 400530540 in words is "four hundred million, five hundred thirty thousand, five hundred forty".