172740 has 24 divisors (see below), whose sum is σ = 483840. Its totient is φ = 46048.
The previous prime is 172721. The next prime is 172741. The reversal of 172740 is 47271.
It is not an unprimeable number, because it can be changed into a prime (172741) by changing a digit.
172740 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1380 + ... + 1499.
It is an arithmetic number, because the mean of its divisors is an integer number (20160).
2172740 is an apocalyptic number.
172740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
172740 is an abundant number, since it is smaller than the sum of its proper divisors (311100).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
172740 is a wasteful number, since it uses less digits than its factorization.
172740 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2891 (or 2889 counting only the distinct ones).
The product of its (nonzero) digits is 392, while the sum is 21.
The square root of 172740 is about 415.6200187671. The cubic root of 172740 is about 55.6926186059.
The spelling of 172740 in words is "one hundred seventy-two thousand, seven hundred forty", and thus it is an iban number.
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