53403440 has 40 divisors (see below), whose sum is σ = 125387808. Its totient is φ = 21150720.

The previous prime is 53403419. The next prime is 53403451. The reversal of 53403440 is 4430435.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5000 + ... + 11480.

Almost surely, 2^53403440 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 53403440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62693904).

53403440 is an abundant number, since it is smaller than the sum of its proper divisors (71984368).

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

53403440 is a wasteful number, since it uses less digits than its factorization.

53403440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6597 (or 6591 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 23.

The square root of 53403440 is about 7307.7657324247. The cubic root of 53403440 is about 376.5792715853.

Adding to 53403440 its reverse (4430435), we get a palindrome (57833875).

The spelling of 53403440 in words is "fifty-three million, four hundred three thousand, four hundred forty".