505658385 has 24 divisors (see below), whose sum is σ = 877054464. Its totient is φ = 269506080.

The previous prime is 505658359. The next prime is 505658393. The reversal of 505658385 is 583856505.

505658385 is a `hidden beast` number, since 5 + 0 + 565 + 8 + 3 + 85 = 666.

It is not a de Polignac number, because 505658385 - 2²⁵ = 472103953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 505658385.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92334 + ... + 97656.

It is an arithmetic number, because the mean of its divisors is an integer number (36543936).

Almost surely, 2^505658385 is an apocalyptic number.

It is an amenable number.

505658385 is a deficient number, since it is larger than the sum of its proper divisors (371396079).

505658385 is a wasteful number, since it uses less digits than its factorization.

505658385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7445 (or 7442 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 45.

The square root of 505658385 is about 22486.8491567849. The cubic root of 505658385 is about 796.6833442663.

The spelling of 505658385 in words is "five hundred five million, six hundred fifty-eight thousand, three hundred eighty-five".