1681662 has 8 divisors (see below), whose sum is σ = 3363336. Its totient is φ = 560552.

The previous prime is 1681661. The next prime is 1681679. The reversal of 1681662 is 2661861.

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

1681662 is an admirable number.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140133 + ... + 140144.

It is an arithmetic number, because the mean of its divisors is an integer number (420417).

2^1681662 is an apocalyptic number.

1681662 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1681662 is a wasteful number, since it uses less digits than its factorization.

1681662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280282.

The product of its digits is 3456, while the sum is 30.

The square root of 1681662 is about 1296.7891116138. The cubic root of 1681662 is about 118.9176277157.

It can be divided in two parts, 168 and 1662, that added together give a triangular number (1830 = T₆₀).

The spelling of 1681662 in words is "one million, six hundred eighty-one thousand, six hundred sixty-two".