1681607 has 4 divisors (see below), whose sum is σ = 1694976. Its totient is φ = 1668240.

The previous prime is 1681597. The next prime is 1681619. The reversal of 1681607 is 7061861.

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

It is a cyclic number.

It is not a de Polignac number, because 1681607 - 2⁴ = 1681591 is a prime.

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 1681607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6494 + ... + 6747.

It is an arithmetic number, because the mean of its divisors is an integer number (423744).

2^1681607 is an apocalyptic number.

1681607 is a deficient number, since it is larger than the sum of its proper divisors (13369).

1681607 is a wasteful number, since it uses less digits than its factorization.

1681607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13368.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1681607 is about 1296.7679052167. The cubic root of 1681607 is about 118.9163312719.

The spelling of 1681607 in words is "one million, six hundred eighty-one thousand, six hundred seven".