665387 has 2 divisors, whose sum is σ = 665388. Its totient is φ = 665386.

The previous prime is 665381. The next prime is 665419. The reversal of 665387 is 783566.

It is a happy number.

665387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665387 - 2⁸ = 665131 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (665381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332693 + 332694.

It is an arithmetic number, because the mean of its divisors is an integer number (332694).

2⁶⁶⁵³⁸⁷ is an apocalyptic number.

665387 is a deficient number, since it is larger than the sum of its proper divisors (1).

665387 is an equidigital number, since it uses as much as digits as its factorization.

665387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 35.

The square root of 665387 is about 815.7125719271. The cubic root of 665387 is about 87.3021160822.

The spelling of 665387 in words is "six hundred sixty-five thousand, three hundred eighty-seven".