172782138 has 8 divisors (see below), whose sum is σ = 345564288. Its totient is φ = 57594044.

The previous prime is 172782133. The next prime is 172782139. The reversal of 172782138 is 831287271.

It is a sphenic number, since it is the product of 3 distinct primes.

172782138 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 172782096 and 172782105.

It is not an unprimeable number, because it can be changed into a prime (172782131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14398506 + ... + 14398517.

It is an arithmetic number, because the mean of its divisors is an integer number (43195536).

Almost surely, 2^172782138 is an apocalyptic number.

172782138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

172782138 is a wasteful number, since it uses less digits than its factorization.

172782138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28797028.

The product of its digits is 37632, while the sum is 39.

The square root of 172782138 is about 13144.6619583769. The cubic root of 172782138 is about 556.9714676917.

The spelling of 172782138 in words is "one hundred seventy-two million, seven hundred eighty-two thousand, one hundred thirty-eight".