247140 has 36 divisors (see below), whose sum is σ = 750204. Its totient is φ = 65856.
The previous prime is 247099. The next prime is 247141. The reversal of 247140 is 41742.
It is a happy number.
247140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It can be written as a sum of positive squares in 2 ways, for example, as 186624 + 60516 = 432^2 + 246^2 .
It is a tau number, because it is divible by the number of its divisors (36).
It is a super-2 number, since 2×2471402 = 122156359200, which contains 22 as substring.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (247141) by changing a digit.
247140 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 507 + ... + 866.
It is an arithmetic number, because the mean of its divisors is an integer number (20839).
2247140 is an apocalyptic number.
247140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
247140 is an abundant number, since it is smaller than the sum of its proper divisors (503064).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
247140 is a wasteful number, since it uses less digits than its factorization.
247140 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1388 (or 1383 counting only the distinct ones).
The product of its (nonzero) digits is 224, while the sum is 18.
The square root of 247140 is about 497.1317732755. The cubic root of 247140 is about 62.7549056233.
Adding to 247140 its reverse (41742), we get a palindrome (288882).
The spelling of 247140 in words is "two hundred forty-seven thousand, one hundred forty", and thus it is an iban number.
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