505779923 has 12 divisors (see below), whose sum is σ = 571452648. Its totient is φ = 443936640.

The previous prime is 505779907. The next prime is 505779929. The reversal of 505779923 is 329977505.

It is not a de Polignac number, because 505779923 - 2⁴ = 505779907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505779929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18086 + ... + 36587.

It is an arithmetic number, because the mean of its divisors is an integer number (47621054).

Almost surely, 2^505779923 is an apocalyptic number.

505779923 is a deficient number, since it is larger than the sum of its proper divisors (65672725).

505779923 is a wasteful number, since it uses less digits than its factorization.

505779923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54742 (or 54713 counting only the distinct ones).

The product of its (nonzero) digits is 595350, while the sum is 47.

The square root of 505779923 is about 22489.5514183809. The cubic root of 505779923 is about 796.7471683463.

The spelling of 505779923 in words is "five hundred five million, seven hundred seventy-nine thousand, nine hundred twenty-three".