• 207 can be written using four 4's:
207 has 6 divisors (see below), whose sum is σ = 312. Its totient is φ = 132.
The previous prime is 199. The next prime is 211. The reversal of 207 is 702.
207 is nontrivially palindromic in base 7.
207 is an esthetic number in base 6 and base 15, because in such bases its adjacent digits differ by 1.
It is not a de Polignac number, because 207 - 23 = 199 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 23 = 207 / (2 + 0 + 7).
207 is an undulating number in base 7.
It is a plaindrome in base 11, base 13 and base 16.
It is a nialpdrome in base 6 and base 15.
It is a zygodrome in base 2.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (227) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3 + ... + 20.
It is an arithmetic number, because the mean of its divisors is an integer number (52).
207 is a deficient number, since it is larger than the sum of its proper divisors (105).
207 is a wasteful number, since it uses less digits than its factorization.
207 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 29 (or 26 counting only the distinct ones).
The product of its (nonzero) digits is 14, while the sum is 9.
The square root of 207 is about 14.3874945699. The cubic root of 207 is about 5.9154816997.
Adding to 207 its reverse (702), we get a palindrome (909).
It can be divided in two parts, 20 and 7, that added together give a cube (27 = 33).
The spelling of 207 in words is "two hundred seven", and thus it is an aban number and an iban number.
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