667869 has 8 divisors (see below), whose sum is σ = 937440. Its totient is φ = 421776.

The previous prime is 667867. The next prime is 667883. The reversal of 667869 is 968766.

It is a happy number.

667869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 667869 - 2¹ = 667867 is a prime.

It is a super-2 number, since 2×667869² = 892098002322, which contains 22 as substring.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 667869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5802 + ... + 5915.

It is an arithmetic number, because the mean of its divisors is an integer number (117180).

2⁶⁶⁷⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

667869 is a deficient number, since it is larger than the sum of its proper divisors (269571).

667869 is a wasteful number, since it uses less digits than its factorization.

667869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11739.

The product of its digits is 108864, while the sum is 42.

The square root of 667869 is about 817.2325250502. The cubic root of 667869 is about 87.4105316795.

It can be divided in two parts, 66786 and 9, that added together give a triangular number (66795 = T₃₆₅).

The spelling of 667869 in words is "six hundred sixty-seven thousand, eight hundred sixty-nine".