53440040 has 64 divisors (see below), whose sum is σ = 129859200. Its totient is φ = 19731712.

The previous prime is 53440031. The next prime is 53440091. The reversal of 53440040 is 4004435.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 53439994 and 53440021.

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, 25679 + ... + 27681.

It is an arithmetic number, because the mean of its divisors is an integer number (2029050).

Almost surely, 2^53440040 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 53440040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64929600).

53440040 is an abundant number, since it is smaller than the sum of its proper divisors (76419160).

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

53440040 is a wasteful number, since it uses less digits than its factorization.

53440040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2066 (or 2062 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 53440040 is about 7310.2694888766. The cubic root of 53440040 is about 376.6652813621.

Adding to 53440040 its reverse (4004435), we get a palindrome (57444475).

The spelling of 53440040 in words is "fifty-three million, four hundred forty thousand, forty".