53404240 has 20 divisors (see below), whose sum is σ = 124165044. Its totient is φ = 21361664.

The previous prime is 53404207. The next prime is 53404261. The reversal of 53404240 is 4240435.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 42302016 + 11102224 = 6504^2 + 3332^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333697 + ... + 333856.

Almost surely, 2^53404240 is an apocalyptic number.

It is an amenable number.

53404240 is an abundant number, since it is smaller than the sum of its proper divisors (70760804).

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

53404240 is a wasteful number, since it uses less digits than its factorization.

53404240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667566 (or 667560 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 53404240 is about 7307.8204685118. The cubic root of 53404240 is about 376.5811520005.

Adding to 53404240 its reverse (4240435), we get a palindrome (57644675).

The spelling of 53404240 in words is "fifty-three million, four hundred four thousand, two hundred forty".