53440321 has 8 divisors (see below), whose sum is σ = 59874624. Its totient is φ = 47268720.

The previous prime is 53440267. The next prime is 53440337. The reversal of 53440321 is 12304435.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 53440321 - 2¹⁹ = 52916033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 53440292 and 53440301.

It is not an unprimeable number, because it can be changed into a prime (53440391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65245 + ... + 66058.

It is an arithmetic number, because the mean of its divisors is an integer number (7484328).

Almost surely, 2^53440321 is an apocalyptic number.

It is an amenable number.

53440321 is a deficient number, since it is larger than the sum of its proper divisors (6434303).

53440321 is a wasteful number, since it uses less digits than its factorization.

53440321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131351.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 53440321 is about 7310.2887083890. The cubic root of 53440321 is about 376.6659415585.

Adding to 53440321 its reverse (12304435), we get a palindrome (65744756).

The spelling of 53440321 in words is "fifty-three million, four hundred forty thousand, three hundred twenty-one".