161724 has 12 divisors (see below), whose sum is σ = 377384. Its totient is φ = 53904.

The previous prime is 161717. The next prime is 161729. The reversal of 161724 is 427161.

It is a tau number, because it is divible by the number of its divisors (12).

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 161724.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161729) 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, 6727 + ... + 6750.

2¹⁶¹⁷²⁴ is an apocalyptic number.

It is an amenable number.

161724 is an abundant number, since it is smaller than the sum of its proper divisors (215660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161724 is a wasteful number, since it uses less digits than its factorization.

161724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13484 (or 13482 counting only the distinct ones).

The product of its digits is 336, while the sum is 21.

The square root of 161724 is about 402.1492260343. The cubic root of 161724 is about 54.4826418362.

Adding to 161724 its reverse (427161), we get a palindrome (588885).

The spelling of 161724 in words is "one hundred sixty-one thousand, seven hundred twenty-four".