172390 has 8 divisors (see below), whose sum is σ = 310320. Its totient is φ = 68952.

The previous prime is 172373. The next prime is 172399. The reversal of 172390 is 93271.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8610 + ... + 8629.

It is an arithmetic number, because the mean of its divisors is an integer number (38790).

2¹⁷²³⁹⁰ is an apocalyptic number.

172390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172390 is a deficient number, since it is larger than the sum of its proper divisors (137930).

172390 is a wasteful number, since it uses less digits than its factorization.

172390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17246.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 172390 is about 415.1987475896. The cubic root of 172390 is about 55.6549790005.

The spelling of 172390 in words is "one hundred seventy-two thousand, three hundred ninety".