505139172 has 24 divisors (see below), whose sum is σ = 1216680192. Its totient is φ = 162948000.

The previous prime is 505139171. The next prime is 505139191. The reversal of 505139172 is 271931505.

It is not an unprimeable number, because it can be changed into a prime (505139171) 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, 678579 + ... + 679322.

It is an arithmetic number, because the mean of its divisors is an integer number (50695008).

Almost surely, 2^505139172 is an apocalyptic number.

It is an amenable number.

505139172 is an abundant number, since it is smaller than the sum of its proper divisors (711541020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

505139172 is a wasteful number, since it uses less digits than its factorization.

505139172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357939 (or 1357937 counting only the distinct ones).

The product of its (nonzero) digits is 9450, while the sum is 33.

The square root of 505139172 is about 22475.3013772897. The cubic root of 505139172 is about 796.4105711707.

It can be divided in two parts, 50513 and 9172, that added together give a triangular number (59685 = T₃₄₅).

The spelling of 505139172 in words is "five hundred five million, one hundred thirty-nine thousand, one hundred seventy-two".