865830813 has 8 divisors (see below), whose sum is σ = 1154635776. Its totient is φ = 577123200.

The previous prime is 865830809. The next prime is 865830853. The reversal of 865830813 is 318038568.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 865830813 - 2² = 865830809 is a prime.

It is a super-3 number, since 3×865830813³ (a number of 28 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865830803) 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, 148 + ... + 41613.

It is an arithmetic number, because the mean of its divisors is an integer number (144329472).

Almost surely, 2^865830813 is an apocalyptic number.

It is an amenable number.

865830813 is a deficient number, since it is larger than the sum of its proper divisors (288804963).

865830813 is a wasteful number, since it uses less digits than its factorization.

865830813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48675.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 865830813 is about 29425.0031945623. The cubic root of 865830813 is about 953.1128960255.

The spelling of 865830813 in words is "eight hundred sixty-five million, eight hundred thirty thousand, eight hundred thirteen".