1680427 has 8 divisors (see below), whose sum is σ = 1949696. Its totient is φ = 1418472.

The previous prime is 1680421. The next prime is 1680431. The reversal of 1680427 is 7240861.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1680427 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1680395 and 1680404.

It is not an unprimeable number, because it can be changed into a prime (1680421) 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, 1323 + ... + 2260.

It is an arithmetic number, because the mean of its divisors is an integer number (243712).

2^1680427 is an apocalyptic number.

1680427 is a deficient number, since it is larger than the sum of its proper divisors (269269).

1680427 is an equidigital number, since it uses as much as digits as its factorization.

1680427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3657.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 1680427 is about 1296.3128480425. The cubic root of 1680427 is about 118.8885098476. Note that the first 3 decimals are identical.

The spelling of 1680427 in words is "one million, six hundred eighty thousand, four hundred twenty-seven".