53405215 has 4 divisors (see below), whose sum is σ = 64086264. Its totient is φ = 42724168.

The previous prime is 53405201. The next prime is 53405239. The reversal of 53405215 is 51250435.

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

It is a cyclic number.

It is not a de Polignac number, because 53405215 - 2²⁵ = 19850783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53405215.

It is a congruent 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, 5340517 + ... + 5340526.

It is an arithmetic number, because the mean of its divisors is an integer number (16021566).

Almost surely, 2^53405215 is an apocalyptic number.

53405215 is a deficient number, since it is larger than the sum of its proper divisors (10681049).

53405215 is a wasteful number, since it uses less digits than its factorization.

53405215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10681048.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 53405215 is about 7307.8871775637. The cubic root of 53405215 is about 376.5834437310.

The spelling of 53405215 in words is "fifty-three million, four hundred five thousand, two hundred fifteen".