53947209 has 4 divisors (see below), whose sum is σ = 71929616. Its totient is φ = 35964804.

The previous prime is 53947193. The next prime is 53947249. The reversal of 53947209 is 90274935.

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 not a de Polignac number, because 53947209 - 2⁴ = 53947193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (53947249) 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, 8991199 + ... + 8991204.

It is an arithmetic number, because the mean of its divisors is an integer number (17982404).

Almost surely, 2^53947209 is an apocalyptic number.

It is an amenable number.

53947209 is a deficient number, since it is larger than the sum of its proper divisors (17982407).

53947209 is a wasteful number, since it uses less digits than its factorization.

53947209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17982406.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 53947209 is about 7344.8763774484. The cubic root of 53947209 is about 377.8531035270.

The spelling of 53947209 in words is "fifty-three million, nine hundred forty-seven thousand, two hundred nine".