172240 has 20 divisors (see below), whose sum is σ = 400644. Its totient is φ = 68864.

The previous prime is 172223. The next prime is 172243. The reversal of 172240 is 42271.

It can be written as a sum of positive squares in 2 ways, for example, as 33856 + 138384 = 184^2 + 372^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172243) 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, 997 + ... + 1156.

2¹⁷²²⁴⁰ is an apocalyptic number.

172240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172240 is an abundant number, since it is smaller than the sum of its proper divisors (228404).

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

172240 is a wasteful number, since it uses less digits than its factorization.

172240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2166 (or 2160 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 172240 is about 415.0180718957. The cubic root of 172240 is about 55.6388321448.

The spelling of 172240 in words is "one hundred seventy-two thousand, two hundred forty", and thus it is an iban number.