1680047 has 4 divisors (see below), whose sum is σ = 1711800. Its totient is φ = 1648296.

The previous prime is 1680023. The next prime is 1680071. The reversal of 1680047 is 7400861.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1680023) and next prime (1680071).

It is a cyclic number.

It is not a de Polignac number, because 1680047 - 2¹² = 1675951 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1679998 and 1680025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15797 + ... + 15902.

It is an arithmetic number, because the mean of its divisors is an integer number (427950).

2^1680047 is an apocalyptic number.

1680047 is a deficient number, since it is larger than the sum of its proper divisors (31753).

1680047 is an equidigital number, since it uses as much as digits as its factorization.

1680047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31752.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 1680047 is about 1296.1662701984. The cubic root of 1680047 is about 118.8795476335.

The spelling of 1680047 in words is "one million, six hundred eighty thousand, forty-seven".