665427 has 8 divisors (see below), whose sum is σ = 1014016. Its totient is φ = 380232.

The previous prime is 665419. The next prime is 665429. The reversal of 665427 is 724566.

665427 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 665427 - 2³ = 665419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665394 and 665403.

It is not an unprimeable number, because it can be changed into a prime (665429) 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, 15823 + ... + 15864.

It is an arithmetic number, because the mean of its divisors is an integer number (126752).

2⁶⁶⁵⁴²⁷ is an apocalyptic number.

665427 is a deficient number, since it is larger than the sum of its proper divisors (348589).

665427 is a wasteful number, since it uses less digits than its factorization.

665427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31697.

The product of its digits is 10080, while the sum is 30.

The square root of 665427 is about 815.7370899990. The cubic root of 665427 is about 87.3038654474.

The spelling of 665427 in words is "six hundred sixty-five thousand, four hundred twenty-seven".