52140440 has 64 divisors (see below), whose sum is σ = 128943360. Its totient is φ = 18817920.

The previous prime is 52140409. The next prime is 52140457. The reversal of 52140440 is 4404125.

52140440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71357 + ... + 72083.

It is an arithmetic number, because the mean of its divisors is an integer number (2014740).

Almost surely, 2^52140440 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 52140440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64471680).

52140440 is an abundant number, since it is smaller than the sum of its proper divisors (76802920).

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

52140440 is a wasteful number, since it uses less digits than its factorization.

52140440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912 (or 908 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 52140440 is about 7220.8337468744. The cubic root of 52140440 is about 373.5868353386.

Adding to 52140440 its reverse (4404125), we get a palindrome (56544565).

The spelling of 52140440 in words is "fifty-two million, one hundred forty thousand, four hundred forty".