831240685 has 8 divisors (see below), whose sum is σ = 1088169696. Its totient is φ = 604538640.

The previous prime is 831240667. The next prime is 831240689. The reversal of 831240685 is 586042138.

It is a happy number.

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

It is not a de Polignac number, because 831240685 - 2¹⁵ = 831207917 is a prime.

It is a super-2 number, since 2×831240685² = 1381922152798538450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (831240689) 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, 7556679 + ... + 7556788.

It is an arithmetic number, because the mean of its divisors is an integer number (136021212).

Almost surely, 2^831240685 is an apocalyptic number.

It is an amenable number.

831240685 is a deficient number, since it is larger than the sum of its proper divisors (256929011).

831240685 is a wasteful number, since it uses less digits than its factorization.

831240685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15113483.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 831240685 is about 28831.2449436371. The cubic root of 831240685 is about 940.2476656145.

The spelling of 831240685 in words is "eight hundred thirty-one million, two hundred forty thousand, six hundred eighty-five".