52439665 has 4 divisors (see below), whose sum is σ = 62927604. Its totient is φ = 41951728.

The previous prime is 52439659. The next prime is 52439683. The reversal of 52439665 is 56693425.

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 31270464 + 21169201 = 5592^2 + 4601^2 .

It is a cyclic number.

It is not a de Polignac number, because 52439665 - 2³ = 52439657 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian 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, 5243962 + ... + 5243971.

It is an arithmetic number, because the mean of its divisors is an integer number (15731901).

Almost surely, 2^52439665 is an apocalyptic number.

It is an amenable number.

52439665 is a deficient number, since it is larger than the sum of its proper divisors (10487939).

52439665 is a wasteful number, since it uses less digits than its factorization.

52439665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10487938.

The product of its digits is 194400, while the sum is 40.

The square root of 52439665 is about 7241.5236656383. The cubic root of 52439665 is about 374.3001227523.

The spelling of 52439665 in words is "fifty-two million, four hundred thirty-nine thousand, six hundred sixty-five".