1681670 has 16 divisors (see below), whose sum is σ = 3045168. Its totient is φ = 668640.

The previous prime is 1681661. The next prime is 1681679. The reversal of 1681670 is 761861.

It is an interprime number because it is at equal distance from previous prime (1681661) and next prime (1681679).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681679) 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, 1712 + ... + 2508.

It is an arithmetic number, because the mean of its divisors is an integer number (190323).

2^1681670 is an apocalyptic number.

1681670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1681670 is a deficient number, since it is larger than the sum of its proper divisors (1363498).

1681670 is a wasteful number, since it uses less digits than its factorization.

1681670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015.

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

The square root of 1681670 is about 1296.7921961517. The cubic root of 1681670 is about 118.9178162870.

The spelling of 1681670 in words is "one million, six hundred eighty-one thousand, six hundred seventy".