830905 has 8 divisors (see below), whose sum is σ = 1005192. Its totient is φ = 659328.

The previous prime is 830899. The next prime is 830911. The reversal of 830905 is 509038.

It is an interprime number because it is at equal distance from previous prime (830899) and next prime (830911).

It can be written as a sum of positive squares in 4 ways, for example, as 4624 + 826281 = 68^2 + 909^2 .

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 830905 - 2⁵ = 830873 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 830905.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79 + ... + 1291.

It is an arithmetic number, because the mean of its divisors is an integer number (125649).

2⁸³⁰⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

830905 is a deficient number, since it is larger than the sum of its proper divisors (174287).

830905 is a wasteful number, since it uses less digits than its factorization.

830905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1355.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 830905 is about 911.5399058736. The cubic root of 830905 is about 94.0121079922.

The spelling of 830905 in words is "eight hundred thirty thousand, nine hundred five".