53130440 has 64 divisors (see below), whose sum is σ = 138101760. Its totient is φ = 18181120.

The previous prime is 53130421. The next prime is 53130443. The reversal of 53130440 is 4403135.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (53130443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3929 + ... + 11031.

It is an arithmetic number, because the mean of its divisors is an integer number (2157840).

Almost surely, 2^53130440 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 53130440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69050880).

53130440 is an abundant number, since it is smaller than the sum of its proper divisors (84971320).

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

53130440 is a wasteful number, since it uses less digits than its factorization.

53130440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7142 (or 7138 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 53130440 is about 7289.0630399250. The cubic root of 53130440 is about 375.9364801405.

Adding to 53130440 its reverse (4403135), we get a palindrome (57533575).

The spelling of 53130440 in words is "fifty-three million, one hundred thirty thousand, four hundred forty".