53203440 has 80 divisors (see below), whose sum is σ = 170274816. Its totient is φ = 13728000.

The previous prime is 53203379. The next prime is 53203511. The reversal of 53203440 is 4430235.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3865 + ... + 11015.

Almost surely, 2^53203440 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 53203440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85137408).

53203440 is an abundant number, since it is smaller than the sum of its proper divisors (117071376).

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

53203440 is a wasteful number, since it uses less digits than its factorization.

53203440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7198 (or 7192 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 53203440 is about 7294.0688233660. The cubic root of 53203440 is about 376.1085773650.

Adding to 53203440 its reverse (4430235), we get a palindrome (57633675).

The spelling of 53203440 in words is "fifty-three million, two hundred three thousand, four hundred forty".