1681956 has 36 divisors (see below), whose sum is σ = 4477200. Its totient is φ = 530928.

The previous prime is 1681931. The next prime is 1681957. The reversal of 1681956 is 6591861.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 1681956.

It is not an unprimeable number, because it can be changed into a prime (1681957) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 546 + ... + 1913.

2^1681956 is an apocalyptic number.

It is an amenable number.

1681956 is an abundant number, since it is smaller than the sum of its proper divisors (2795244).

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

1681956 is a wasteful number, since it uses less digits than its factorization.

1681956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2488 (or 2483 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 1681956 is about 1296.9024635646. The cubic root of 1681956 is about 118.9245573177.

The spelling of 1681956 in words is "one million, six hundred eighty-one thousand, nine hundred fifty-six".