172090 has 8 divisors (see below), whose sum is σ = 309780. Its totient is φ = 68832.

The previous prime is 172079. The next prime is 172093. The reversal of 172090 is 90271.

It can be written as a sum of positive squares in 2 ways, for example, as 170569 + 1521 = 413^2 + 39^2 .

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

It is a super-2 number, since 2×172090² = 59229936200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (172093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8595 + ... + 8614.

2¹⁷²⁰⁹⁰ is an apocalyptic number.

172090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172090 is a deficient number, since it is larger than the sum of its proper divisors (137690).

172090 is a wasteful number, since it uses less digits than its factorization.

172090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17216.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 172090 is about 414.8373175113. The cubic root of 172090 is about 55.6226759118.

The spelling of 172090 in words is "one hundred seventy-two thousand, ninety".