172739 has 4 divisors (see below), whose sum is σ = 197424. Its totient is φ = 148056.

The previous prime is 172721. The next prime is 172741. The reversal of 172739 is 937271.

It is a happy number.

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 172739 - 2¹² = 168643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172709) 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, 12332 + ... + 12345.

It is an arithmetic number, because the mean of its divisors is an integer number (49356).

2¹⁷²⁷³⁹ is an apocalyptic number.

172739 is a deficient number, since it is larger than the sum of its proper divisors (24685).

172739 is an equidigital number, since it uses as much as digits as its factorization.

172739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24684.

The product of its digits is 2646, while the sum is 29.

The square root of 172739 is about 415.6188157435. The cubic root of 172739 is about 55.6925111366.

The spelling of 172739 in words is "one hundred seventy-two thousand, seven hundred thirty-nine".