65439953 has 4 divisors (see below), whose sum is σ = 69289380. Its totient is φ = 61590528.

The previous prime is 65439929. The next prime is 65439961. The reversal of 65439953 is 35993456.

65439953 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29343889 + 36096064 = 5417^2 + 6008^2 .

It is a cyclic number.

It is not a de Polignac number, because 65439953 - 2⁶ = 65439889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65439053) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1924688 + ... + 1924721.

It is an arithmetic number, because the mean of its divisors is an integer number (17322345).

Almost surely, 2^65439953 is an apocalyptic number.

It is an amenable number.

65439953 is a deficient number, since it is larger than the sum of its proper divisors (3849427).

65439953 is a wasteful number, since it uses less digits than its factorization.

65439953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3849426.

The product of its digits is 437400, while the sum is 44.

The square root of 65439953 is about 8089.4964614616. The cubic root of 65439953 is about 402.9776806247.

The spelling of 65439953 in words is "sixty-five million, four hundred thirty-nine thousand, nine hundred fifty-three".