1681667 has 8 divisors (see below), whose sum is σ = 1821456. Its totient is φ = 1543392.

The previous prime is 1681661. The next prime is 1681679. The reversal of 1681667 is 7661861.

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

It is a cyclic number.

It is not a de Polignac number, because 1681667 - 2⁴ = 1681651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1681661) 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, 3368 + ... + 3834.

It is an arithmetic number, because the mean of its divisors is an integer number (227682).

2^1681667 is an apocalyptic number.

1681667 is a deficient number, since it is larger than the sum of its proper divisors (139789).

1681667 is a wasteful number, since it uses less digits than its factorization.

1681667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757.

The product of its digits is 12096, while the sum is 35.

The square root of 1681667 is about 1296.7910394508. The cubic root of 1681667 is about 118.9177455728.

The spelling of 1681667 in words is "one million, six hundred eighty-one thousand, six hundred sixty-seven".