172173136 has 40 divisors (see below), whose sum is σ = 360656480. Its totient is φ = 79346304.

The previous prime is 172173121. The next prime is 172173139. The reversal of 172173136 is 631371271.

It is a junction number, because it is equal to n+sod(n) for n = 172173098 and 172173107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172173139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3595 + ... + 18901.

It is an arithmetic number, because the mean of its divisors is an integer number (9016412).

Almost surely, 2^172173136 is an apocalyptic number.

172173136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172173136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180328240).

172173136 is an abundant number, since it is smaller than the sum of its proper divisors (188483344).

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

172173136 is a wasteful number, since it uses less digits than its factorization.

172173136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15371 (or 15365 counting only the distinct ones).

The product of its digits is 5292, while the sum is 31.

The square root of 172173136 is about 13121.4761364718. The cubic root of 172173136 is about 556.3163150159.

The spelling of 172173136 in words is "one hundred seventy-two million, one hundred seventy-three thousand, one hundred thirty-six".