1681894 has 8 divisors (see below), whose sum is σ = 2528568. Its totient is φ = 839040.

The previous prime is 1681891. The next prime is 1681903. The reversal of 1681894 is 4981861.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681891) 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, 774 + ... + 1990.

It is an arithmetic number, because the mean of its divisors is an integer number (316071).

2^1681894 is an apocalyptic number.

1681894 is a deficient number, since it is larger than the sum of its proper divisors (846674).

1681894 is a wasteful number, since it uses less digits than its factorization.

1681894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910.

The product of its digits is 13824, while the sum is 37.

The square root of 1681894 is about 1296.8785602361. The cubic root of 1681894 is about 118.9230960403.

The spelling of 1681894 in words is "one million, six hundred eighty-one thousand, eight hundred ninety-four".