1680831 has 12 divisors (see below), whose sum is σ = 2518152. Its totient is φ = 1120392.

The previous prime is 1680823. The next prime is 1680839. The reversal of 1680831 is 1380861.

It is an interprime number because it is at equal distance from previous prime (1680823) and next prime (1680839).

It is not a de Polignac number, because 1680831 - 2³ = 1680823 is a prime.

It is a super-2 number, since 2×1680831² = 5650385701122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1680795 and 1680804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680839) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3216 + ... + 3701.

It is an arithmetic number, because the mean of its divisors is an integer number (209846).

2^1680831 is an apocalyptic number.

1680831 is a deficient number, since it is larger than the sum of its proper divisors (837321).

1680831 is an frugal number, since it uses more digits than its factorization.

1680831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6932 (or 6920 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1680831 is about 1296.4686652596. The cubic root of 1680831 is about 118.8980366146.

The spelling of 1680831 in words is "one million, six hundred eighty thousand, eight hundred thirty-one".