53405209 has 8 divisors (see below), whose sum is σ = 62741952. Its totient is φ = 44815440.

The previous prime is 53405201. The next prime is 53405239. The reversal of 53405209 is 90250435.

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 53405209 - 2³ = 53405201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53405201) 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, 186589 + ... + 186874.

It is an arithmetic number, because the mean of its divisors is an integer number (7842744).

Almost surely, 2^53405209 is an apocalyptic number.

It is an amenable number.

53405209 is a deficient number, since it is larger than the sum of its proper divisors (9336743).

53405209 is a wasteful number, since it uses less digits than its factorization.

53405209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373487.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 53405209 is about 7307.8867670483. The cubic root of 53405209 is about 376.5834296282.

The spelling of 53405209 in words is "fifty-three million, four hundred five thousand, two hundred nine".