52840309 has 4 divisors (see below), whose sum is σ = 52857504. Its totient is φ = 52823116.

The previous prime is 52840261. The next prime is 52840313. The reversal of 52840309 is 90304825.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 52840309 - 2²¹ = 50743157 is a prime.

It is a Smith number, since the sum of its digits (31) 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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52840009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2587 + ... + 10600.

It is an arithmetic number, because the mean of its divisors is an integer number (13214376).

Almost surely, 2^52840309 is an apocalyptic number.

It is an amenable number.

52840309 is a deficient number, since it is larger than the sum of its proper divisors (17195).

52840309 is a wasteful number, since it uses less digits than its factorization.

52840309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17194.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 52840309 is about 7269.1339924368. The cubic root of 52840309 is about 375.2509348619.

The spelling of 52840309 in words is "fifty-two million, eight hundred forty thousand, three hundred nine".