501865 has 16 divisors (see below), whose sum is σ = 741888. Its totient is φ = 317376.

The previous prime is 501863. The next prime is 501889. The reversal of 501865 is 568105.

It is a cyclic number.

It is not a de Polignac number, because 501865 - 2¹ = 501863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (501863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97 + ... + 1006.

It is an arithmetic number, because the mean of its divisors is an integer number (46368).

2⁵⁰¹⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

501865 is a deficient number, since it is larger than the sum of its proper divisors (240023).

501865 is a wasteful number, since it uses less digits than its factorization.

501865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 501865 is about 708.4243078833. The cubic root of 501865 is about 79.4686135877.

The spelling of 501865 in words is "five hundred one thousand, eight hundred sixty-five".