172903 has 4 divisors (see below), whose sum is σ = 176968. Its totient is φ = 168840.

The previous prime is 172883. The next prime is 172933. The reversal of 172903 is 309271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 172903 - 2⁵ = 172871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172933) 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, 1968 + ... + 2053.

It is an arithmetic number, because the mean of its divisors is an integer number (44242).

2¹⁷²⁹⁰³ is an apocalyptic number.

172903 is a deficient number, since it is larger than the sum of its proper divisors (4065).

172903 is an equidigital number, since it uses as much as digits as its factorization.

172903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4064.

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

The square root of 172903 is about 415.8160651057. The cubic root of 172903 is about 55.7101305564.

The spelling of 172903 in words is "one hundred seventy-two thousand, nine hundred three".