668239 has 8 divisors (see below), whose sum is σ = 785232. Its totient is φ = 560640.

The previous prime is 668221. The next prime is 668243. The reversal of 668239 is 932866.

It is a happy number.

668239 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 a cyclic number.

It is not a de Polignac number, because 668239 - 2⁷ = 668111 is a prime.

It is a super-2 number, since 2×668239² = 893086722242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668209) 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, 2194 + ... + 2479.

It is an arithmetic number, because the mean of its divisors is an integer number (98154).

2⁶⁶⁸²³⁹ is an apocalyptic number.

668239 is a deficient number, since it is larger than the sum of its proper divisors (116993).

668239 is a wasteful number, since it uses less digits than its factorization.

668239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4697.

The product of its digits is 15552, while the sum is 34.

The square root of 668239 is about 817.4588674667. The cubic root of 668239 is about 87.4266705361.

The spelling of 668239 in words is "six hundred sixty-eight thousand, two hundred thirty-nine".