1680931 has 8 divisors (see below), whose sum is σ = 1928960. Its totient is φ = 1434888.

The previous prime is 1680929. The next prime is 1680961. The reversal of 1680931 is 1390861.

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 1680931 - 2¹ = 1680929 is a prime.

It is a super-2 number, since 2×1680931² = 5651058053522, which contains 22 as substring.

It is an Ulam number.

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 1680931.

It is not an unprimeable number, because it can be changed into a prime (1680901) 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, 2800 + ... + 3346.

It is an arithmetic number, because the mean of its divisors is an integer number (241120).

2^1680931 is an apocalyptic number.

1680931 is a deficient number, since it is larger than the sum of its proper divisors (248029).

1680931 is an equidigital number, since it uses as much as digits as its factorization.

1680931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1680931 is about 1296.5072309864. The cubic root of 1680931 is about 118.9003944895.

The spelling of 1680931 in words is "one million, six hundred eighty thousand, nine hundred thirty-one".