172045 has 8 divisors (see below), whose sum is σ = 217440. Its totient is φ = 130320.

The previous prime is 172031. The next prime is 172049. The reversal of 172045 is 540271.

172045 = 86² + 87² + ... + 104².

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

It is not a de Polignac number, because 172045 - 2⁷ = 171917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172049) 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, 811 + ... + 1000.

It is an arithmetic number, because the mean of its divisors is an integer number (27180).

2¹⁷²⁰⁴⁵ is an apocalyptic number.

It is an amenable number.

172045 is a deficient number, since it is larger than the sum of its proper divisors (45395).

172045 is a wasteful number, since it uses less digits than its factorization.

172045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1835.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 172045 is about 414.7830758360. The cubic root of 172045 is about 55.6178272113.

The spelling of 172045 in words is "one hundred seventy-two thousand, forty-five".