515172138 has 16 divisors (see below), whose sum is σ = 1109601696. Its totient is φ = 158514480.

The previous prime is 515172109. The next prime is 515172143. The reversal of 515172138 is 831271515.

It is a junction number, because it is equal to n+sod(n) for n = 515172099 and 515172108.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3302308 + ... + 3302463.

It is an arithmetic number, because the mean of its divisors is an integer number (69350106).

Almost surely, 2^515172138 is an apocalyptic number.

515172138 is an abundant number, since it is smaller than the sum of its proper divisors (594429558).

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

515172138 is a wasteful number, since it uses less digits than its factorization.

515172138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6604789.

The product of its digits is 8400, while the sum is 33.

The square root of 515172138 is about 22697.4037722379. The cubic root of 515172138 is about 801.6487548831.

The spelling of 515172138 in words is "five hundred fifteen million, one hundred seventy-two thousand, one hundred thirty-eight".